三年级下册英语语法总结
三年级的同学如更好地总结三年级下册英语语法?下面带来三年级下册英语语法总结范文，一起去看看!
三年级下册英语语法总结一：询问对方看见的物品的数量的句型
询问对方看见的物品的数量的句型-How many...do you see?
(1)课文应用：How many kites do you see?你看见多少只风筝?
I see 12!我看见12只!
(2)句型结构
问句：How many+可数名词复数(books，kites,apples...)+do you see?
答语：I see+数字.
(3)重点解析
此问句是一个由howmany引导的特殊疑问句，可以用于询问对方看见的物品的数量。
how many意为“多少”，后接可数名词的.复数形式。
do帮助构成疑问句，无实际意义。
三年级下册英语语法总结二：小小替身one
(1)课文应用：The black one is a bird!黑色的那个是一只鸟!
在一些动作片中，有的演员是用了替身的。有趣的是英语里的单词one也可以当替身。在课文中，one就代替了“kite”。需要注意的是one用作代词时，只能代替可数名词单数;若要代替复数的人或物，必须用one的复数形式ones。
例如：
I have five pencils.I like the red one best.
我有五支铅笔，我最喜欢红色的那支铅笔。
I don't like these oranges.I like those one.
我不喜欢这些橙子。我喜欢那些橙子。
此外，one还可以表示数字“一”。
三年级下册英语语法总结三：表达自己是否喜欢某物的句型
表达自己是否喜欢某物的句型-I (don't)like...
(1)课文应用：I like grapes.我喜欢葡萄。
Sorry，I don't like grapes.抱歉，我不喜欢葡萄。
(2)句型结构
I (don't) like+某物(bananas, grapes, apples…).
(3)重点解析
表达自己喜欢某物的句型为“I like+某物”。like意为“喜欢”，它跟在“主人”I的后面，表示“主人”的喜好。但当“主人”不喜欢某物时，don't就会站在like的前面来帮忙了，它与like -起来表达“主人”不喜欢某物。don't是do not的缩写形式，帮助构成否定句。如果like后面接的表示事物的名词是可数名词，要用其复数形式。
巧用don't来否定
在一般现在时的句子中，含有实义动词的肯定句在变为否定句时，需要don't或doesn't来帮忙。如果主语是第三人称单数，要在实义动词前加doesn't，后面接动词原形。例如：She like apples.她不喜欢苹果。如果主语不是第三人称单数，只需在实义动词前加don't。例如：They don't go to school.他们不去上学。
英语语法公式归纳总结
要想学好英语，首先要掌握其语法！以下是英语语法公式归纳总结，一起来看看吧！
英语语法公式归纳总结
第一章 名词性从句
在句子中起名词作用的句子叫名词性从句(Noun Clauses）。 名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
一． 主语从句
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
1. It 作形式主语和it引导强调句的比较
It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人时也可用who/whom。例如：
a) It is a pity that you didn’t go to see the film. 你不去看那场电影真可惜。
b) It doesn’t interest me whether you succeed or not. 我对你成功与否不感兴趣。
c) It is in the morning that the murder took place. 谋杀案是在早上发生的。（强调句型） d) It is John that broke the window. 是John打碎的窗户。（强调句型）
2. 用it 作形式主语的结构
(1) It is ＋ 名词 ＋ 从句
It is a fact that ? 事实是?
It is an honor that ?非常荣幸
It is common knowledge that ?是常识
(2) It is ＋ 形容词 ＋ 从句
It is natural that? 很自然?
It is strange that? 奇怪的是?
(3) It is ＋ 不及物动词 ＋ 从句
It seems that? 似乎?
It happened that? 碰巧?
It appears that? 似乎?
(4) It ＋ 过去分词 ＋ 从句
It is reported that? 据报道?
It has been proved that? 已证实?
It is said that? 据说?
3. 主语从句不可位于句首的五种情况：
（1）if 引导的主语从句不可居于复合句句首。
（2）It is said /reported?结构中的主语从句不可提前。例如：
正确表达：It is said that President Jiang will visit our school next week.
错误表达：That President Jiang will visit our school next week is said.
（3）It happens/occurs?结构中的主语从句不可提前。例如：
正确表达：It occurred to him that he failed in the examination.
错误表达：That he failed in the examination occurred to him.
（4）It doesn’t matter how/whether ?结构中的主语从句不可提前。例如：
正确表达：It doesn’t matter whether he is wrong or not.
错误表达：Whether he is wrong or not doesn’t matter.
（5）含主语从句的复合句是疑问句时，主语从句不可提前。例如：
正确表达：Is it likely that it will rain in the evening?
错误表达：Is that will rain in the evening likely?
4. what 与that 在引导主语从句时的区别
what 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：
a) What you said yesterday is right.
b) That she is still alive is a consolation
二．宾语从句
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词 (及物动词) 或介词之后。
1. 作动词的宾语
(1) 由that引导的宾语从句(that 通常可以省略), 例如：
I heard that be joined the army. 我听说他参军了。
(2) 由what, whether (if) 引导的宾语从句，例如：
a) She did not know what had happened. 她不知道发生了什么。
b) I wonder whether you can change this note for me. 我想知道你是否能帮我改一下笔记。
(3) 动词＋间接宾语＋宾语从句。例如：
She told me that she would accept my invitation. 她对我说她会接受我的邀请。
2. 作介词的宾语，例如：
Our success depends upon how well we can cooperate with one another. 我们的成功取决于我们之间的合作。
3. 作形容词的`宾语，例如：
I am afraid (that) I’ve made a mistake. 我恐怕我已经犯了一个错误。
注意：that 引导的从句常跟在下列形容词后作宾语：anxious, aware, certain, confident, convinced, determined, glad, proud, surprised, worried, sorry, thankful, ashamed, disappointed, annoyed, pleased, hurt, satisfied, content 等。也可以将此类词后的that 从句的看作原因状语从句。
4. it 可以作为形式宾语
it 不仅可以作为形式主语，还可以作为形式宾语而真正的宾语that 从句则放在句尾，特别是在带复合宾语的句子中。 例如：
We heard it that she would get married next month. 我听说她下个朋就会结婚了。
5. 后边不能直接跟that 从句的动词
这类动词有allow, refuse, let, like, cause, force, admire, condemn, celebrate, dislike, love, help, take, forgive等。这类词后可以用不定式或动名词作宾语，但不可以用that引导的宾语从句。如：
正确表达：I admire their winning the match.
错误表达：I admire that they won the match.
6. 不可用that从句作直接宾语的动词
有些动词不可用于“动词＋间接宾语＋that从句“结构中，常见的有envy, order, accuse, refuse, impress, forgive, blame, denounce, advise, congratulate等。例如：
正确表达：He impressed the manager as an honest man.
错误表达：He impressed the manager that he was an honest man.
7. 否定的转移
若主句谓语动词为think, consider, suppose, believe, expect, fancy, guess, imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式。例如：
I don’t think this dress fits you well. 我认为这件衣服不适合你穿。
三. 表语从句
表语从句在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语＋连系动词＋表语从句”。可以接表语从句的连系动词有be, look, remain, seem等。引导表语从句的that常可省略。另外，常用的还有the reason is that? 和It is because 等结构。例如：
1) The question is whether we can make good preparation in such a short time.
2) This is why we can’t get the support of the people.
3) But the fact remains that we are behind the other classes.
4) The reason he is late for school is that he missed the early bus.
四. 同位语从句
同位语从句就是在复合句中作名词的同位语的名词性从句。
1. 同位语从句的功能
同位语从句对于名词进一步解释，说明名词的具体内容，一般由that引导，例如：
1) The king’s decision that the prisoner would be set free surprised all the people.
2) The order that all the soldiers should stay still is given by the general.
2. 同位语在句子中的位置
同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开。例如： He got the news from Mary that the sports meeting was put off.
3. 同位语从句与定语从句的区别
(1) 定语从句中的that既代替先行词，同时以在从句中作某个成分（主语或宾语），而同位语从句中的that是连词，只起连接主句与从句的作用，不充当句中任何成分。
(2) 定语从句是形容词性的，其功能是修饰先行词，对先行词加以限定，描述定的性质或特征；同位语从句是名词性的，其功能是对名词进行补充说明。例如：
1) The news that he told me is that Tom would go abroad next year.（他告诉我的消息是汤姆明年将出国。）（第一个that引导的从句是定语从句，that在从句中作宾语）
2)The news that Tom would go abroad is told by him.（汤姆将出国的消息是他讲的。）（同位语从句，that在句中不作任何成分）
高一英语名词性从句专项练习
2. The manager came over and asked the customer how____
A. did the quarrel came about B .the quarrel had come about
C. had the quarrel come about D. had the quarrel come about
3. Energy is ____makes thing work..
A. what B. something C. anything D. that
4. Information has been put forward ____ more middle school graduates will be admitted into universities.
A. while B. that C. when D. as
5. This is ___the Shenzhou V Spaceship landed.
A. there B. in which C. where D. when
6. They have no idea at all____.
A. where he has gone B. where did he go
C. which place has he gone D. where has he gone
7. The doctor did a lot to reduce the patient’s fear ____he would die of the disease.
A. that B. which C. of which D. of that
8. The order said ___the soldiers ____the small village the next morning.
A. that ;had to leave B. that; should leave
C. /; must leave D. when; should leave
9. ___is no possibility ____Bob can win the first prize in the match.
A. There; that B. It; that C. there; whether D. It; whether
10. The question came up at the meeting_____ we had enough money for our research.
A. that B. which C. whether D. if
11. Is _____he said really true?
A. that B. what C. why D. whether
12.____the meeting should last two days or three days doesn’t matter.
A. That B. Whether C. If D. Where
13. It worried her a bit _____her hair was turning gray.
A. while B. if C. that D. for
14. _____more countries can use natural energy in the future remains to be seen.
A. Whether B. This C. who D. If
15.____he will go to work in a mountain village surprises all of us.
A. What B. That C. Whether D. If
16. ____you don’t like him is none of my business.
A. What B. That C. Who D. Which
17.____all the inventions have in common is ____they have succeeded.
A. What; what B. That; that C. what; that D. That ; what
18. ____appeared to me that he enjoyed the food very much.
A. What B. It C. All that D. That
19. It is widely ______that smoking can cause cancer.
A. believed B. think C. say D. hoped
20. ____caused the accident is still a complete mystery.
A. What B. That C. How D. Where
Keys:
1—5 ABABC 6—10 AABAC 11—15 BBCAB 16—20 BCBAA
第二章 “It”用法及其句型和固定搭配讲解
一、It用作实词
表达以下概念:指代前文提到的事物；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象??
二、It用作形式主语
替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。
It 作形式主语的常见句型：
1. 代作主语的动词不定式，其句型为
(1) It be adj. (for sb.) to do sth.
此处adj. 通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible, impossible, likely, unlikely, right, wrong, important, unimportant, legal, illegal, well-mannered, ill-mannered, polite, impolite, clear, obvious, certain, suitable, proper, fit, useful,
初中英语语法总结大纲
初中英语是一个长期积累的过程，小编收集到初中英语语法总结大纲，需要可以帮助同学们系统总结初中英语语法。
构词法：英语构词法主要有：合成法、派生法和转换法。
1、合成法：如：spaceship, headache, basketball, playground等等。
2、派生法：(1)派生名词：①动词+er/or ②动词+ing ③动词+(t)ion ④形容词+ness ⑤其他,如：inventor, learner, swimming, congratulation, kindness, carelessness, knowledge
(2)派生形容词：①名词+y ②名词+ful ③动词+ing/ed ④friendly ⑤dangerous ⑥Chinese; Japanese ⑦English ⑧French ⑨German ⑩国名+(i)an 如：snowy, sunny, hopeful, beautiful, interesting, following, daily(每日的),nervous, delicious
(3)派生副词：①形容词+ly ②其它,如：slowly, angrily, full→fully, good→well, possible→possibly
3、转换法：
(1)形容词→动词,如：dry(干燥的)→dry(弄干), clean(干净的)→clean(打扫,弄干净),等等。
(2)动词→名词,如：look, walk, rest, work, study, swim, go, talk等等。
(3)名词→动词,如：hand(手)→(传递),face(脸)→(面对)等等。
(4)形容词→副词,如：early→early, fast→fast等等。
(5)副词→连词,如：when(什么时候)→(当……时候),等等。
(6)介词→副词,如：in(到……里)→(在里面;在家),on(在…上)→(进行,继续)
名词：
1、英语名词可分专有名词和普通名词两大类：
1、专有名词是个别的人、地、物、团体、机构等的专用名称。
专有名词如果是含有普通名词的短语,则必须使用定冠词the。如：the Great Wall(长城)
姓氏名如果采用复数形式,则表示该姓氏一家人(复数含义),如：the Greens( 格林一家人)。
2、普通名词又分为可数名词和不可数名词。
2、英语可数名词的单复数：英语可数名词有单数和复数两种形式。
1hero→heroes, photo→photos, piano→pianos.
不可数名词一般没有复数形式,说明其数量时,要用有关计量名词。一盒牛奶：
3、名词所有格：
1、 名词所有格如：Childern’s Day(儿童节), my sister’s book(我姐姐的书)
(2)以s或es结尾的复数名词。只在词尾加’。如：Teachers’ Day(教师节)
(3)有些表示时间、距离以及世界、国家、城镇等无生命的名词,也可在词尾加’s. 如：
today’s newspaper(今天的报纸), ten minutes’ break(十分钟的课间休息),
(4)无论表示有生命还是无生命的东西的名词,一般均可用介词of短语来表示所有关系。如：
2、[注解]：
① ‘s还可以表示某人的家或者某个店铺,如：my aunt’s(我阿姨家), the doctor’s(诊所)
② 两人共有某物时,可以采用 A and B’s 的形式,如：Lucy and Lily’s bedroom(露西和丽丽合住的卧室)
③ “of+名词所有格/名词性物主代词”,称为双重所有格,如：a friend of my father’s(我父亲的一位朋友), a friend of mine(我的一位朋友)
4、名词或代词作主语时和谓语之间的单复数的一致问题：
1、谓语和谓语基本保持单复数的一致,即：主语是可数名词单数或不可数名词时,谓语动词用单数形式：如：The computer was a great invention.(计算机是个了不起的发明)The water in the glass is very cold.(玻璃杯里的水很冷)
2、集体名词(如family, class, team, group, row, police, school等)做句子主语时,
① 如果表示整体概念,则谓语用单数形式,如：Class Three is a very good class.(三班是好班)
② 如果表示其中的所有成员时,则谓语用复数形式,如：Class Three have a map of China.(三
班有张中国地图)
3、Chinese, Japanese, fish, sheep, people等表示单个时谓语用单数,表示许多时,谓语用复数。如：There is a sheep in the yard.(院子里有只绵羊) / There are some sheep in the yard.(院子里有一些绵羊)
4、maths, news等虽然有s结尾,但不是复数,因此谓语仍用单数：The news is very exciting. (这个消息令人兴奋)
5、glasses, shoes, socks, trousers, gloves等名词往往用复数形式,故谓语用复数。如：
The trousers are very cheap and I want to take them.(裤子很便宜,我想买)
6、a lot of 后跟名词复数时谓语用复数形式,跟不可数名词时谓语用单数形式。如：A lot of students are playing baseball now.(现在有许多学生在打垒球) A lot of time was wasted on that work.(大量的时间花在了那个工作上)(被动句)
7、and 连接两个名词做主语时,谓语原则上用复数,但是两个名词若构成一个整体事物时,谓语则用单数。如：The teacher and his son are picking apples now.(老师和他的儿子在摘苹果) / Fish and chips is very famous food. (鱼和薯条是一种出名的食品)
8、 there be 句型中be的单复数一般由靠近的名词决定。如：There is a table and four chairs in the room.(房间里有一张桌子和四张椅子)
9、用both…and…连接两个事物做主语时,谓语一般用复数。如：Both you and I are required to be here tomorrow.(你和我明天要求都来)
10、主语中含有with的短语时,谓语单复数由with之前的人物决定。如：A woman with a 7-year-old child was standing at the side of the road. (一名妇女带着一个七岁的孩子(当时)就站在路边)
11、either…or…或者 neither…nor…连接两个人物做句子主语时,谓语采用就近原则。如：Either you or he is right.(要么是你对,要么是他对。/你和他有一个人是对的) / Neither you nor I am going there.(你和我都不打算去那里)
12、表示一段时间或长度概念的复数名词做主语时,谓语一般用单数。如：Two months is not a short time.(两个月不是个短时间)Two thousand kilometers is quite a long distance(距离).(两千千米是相当长的一段距离)
13、主语中含有half of… / (three quarters)of… / all (of) the ….等词语时,谓语的单复数由名词确定,如：Over three quarters of the information on the Internet is in English. / A third of the students were playing near the lake.(学生的三分之一(当时)正在湖边玩耍) / All of the water in these rivers has been polluted.(这些河流中的水已经被污染了)(被动句)
但是,population一词又有特殊情况： What’s the population of China?(中国人口是多少?)(句子用单数) / Three quarters of the population in this city are Arabs(阿拉伯人).(这个城市四分之三的人口是阿拉伯人)(句子用复数)
5、部分名词用法辨析：
1、sport、game、match、race 的区别：sport通常指“户外运动”,以锻炼为主,概念较大;game意思是“运动、比赛”,不管户内户外还是脑力体力,指以胜负为主的运动;match意为“竞赛、比赛”,多指正式比赛;race主要表示“赛跑、赛马、赛车”。如：People all around the world enjoy sports.(全世界的人都喜爱运动) / The 2022 Olympic Games will be held in Beijing.(2022奥运会将在北京举行)(被动句) / Our school football team won the league match(联赛).(我们学校足球队取得了联赛冠军) / They were strong and won the boat race.(汤他们很棒,赢得了划艇比赛)
2、festival、holiday、vacation的区别：festival“节日”,指喜庆的日子或持续一段时间的文娱活动;holiday(假日、休息日),指法定假日或风俗习惯,复数可以表示一个较长的假期;vacation“假期”,指学习或工作中一段长时间的.休息。如：The Shanghai Television Festival will be held next month.(上海电视节将在下个月举行) / Sunday is a holiday and most people do not work.(星期天是个假日,多数人不工作) / What are you going to do during the summer vacation/holidays?(在暑期你打算做什么事情?)
3、journey、tour、trip、travel的区别：journey指在陆地上(或海上或空中)进行的长途旅行,不知终点,含有辛苦的意思;tour指途中作短期逗留的巡回旅行,强调游览多处,常用来指观光等;trip通常指往返定时的短途旅行,如出差度假等;travel多指长期或长途的观光旅行,尤其指到国外,没有明确目的地,也作不可数名词,指旅行这一行为。如：He made up his mind to make the journey to Dunhuang.(他拿定主意要去敦煌旅行)/ He has gone on a walking tour.(他步行观光去了) / He took several trips to Shanghai last yeaar.(去年他去了上海好几次) / Did you go to Santiago(圣地亚哥) during your travels?(旅行期间你去圣地亚哥了吗?) / Travelling through thick forests is dangerous.(在密林里边穿行是很危险的)
4、sound、noise、voice的区别：sound指各种声音;noise主要指“噪音”;voice指人的“嗓音”。如：The noise of the street kept me awake in the night.(街上的喧嚣声让我彻夜难眠) / All of a sudden there was the sound of shots and a cry.(突然间传来几声枪响和一声尖叫) / The singer has lost her ringing voice as a result of a bad cold.(因为感冒的缘故,这个歌唱家失去了她银铃般的嗓音)
5、fish的问题：指许多条鱼且不管种类时,用fish,单复数相同;fishes 指许多种类的鱼;fish指“鱼肉”时是不可数名词。如：There are many kinds of fishes in the pool. (池子里有很多种类的鱼)/ I prefer fish to meat.(与肉相比我更喜欢鱼)
代词：
1、代词的分类：英语中代词分为：人称代词、物主代词、反身代词、指示代词、关系代词、疑问代词、连接代词和不定代词等等。
2、人称代词：人称代词代替人和事物的名称,分为主格和宾格两种形式。
高二英语语法点总结全
表示时间的 in 和 after：两者都表示“在(某个时间)之后，区别在于in表示“在(一段时间)之后” ，而 after 则表示“在(某一具体时间点之后)，in短语和将来时态连用，after 短语和过去时态或将来时态连用。以下是小编为大家整理分享的高二英语语法点总结全，欢迎阅读参考。
高二英语语法点总结全1
1、at
如：常用词组有： at noon, at night
表示时间的 at, in, on：表示片刻的时间，at 8 o’clock，at midnight, at the end of, at that time, at the beginning of, at the age of, at Christmas, at New Year 等。
in 表示一段的时间
如：in the morning, in the afternoon, in the evening, in October, in 1998, in summer, in the past, in the future 等。
on 总是跟日子有关，on Monday, on Christmas morning, on the following, on May Day, on a warm morning 等。
2、表示时间的 since 和 from：since 表示从过去到现在的一段时间的过程，常与现在完成时连用：from 表示从时间的某一点开始，不涉及与现在的关系。一般多与现在时、过去时、将来时连用。
如：I hope to do morning exercises from today./ We have not seen each other since 1995.
3、表示时间的 in 和 after：两者都表示“在(某个时间)之后，区别在于in表示“在(一段时间)之后” ，而 after 则表示“在(某一具体时间点之后)，in短语和将来时态连用，after 短语和过去时态或将来时态连用。
如：We’ll be back in three days.
After seven the rain began to fall.
What shall we do after graduation?
After two months he returned. 注意：after 有时也可以表示在一段时间之后(常用在过去时里)
4、表示地理位置的 in, on, to：in 表示在某范围内，on 指与什么毗邻，to 指在某环境范围之外
如：Changchun is in the northeast of China./ Mongolia is on the north of China./ Japan is tothe east of China.
5、表示“在……上”的 on 和 in：on 只表示在某物的表面上，而用 in 表示占去某物一部分，表示……上。
如：There is a book on the piece of paper./ There is an interesting article in the newspaper./ He dug a hole in the wall.
高二英语语法点总结全2
介词又叫前置词，是一种虚词。
介词分为三种，一种是简单介词，如 at, in, on, beside, to , for 等;另一种是短语介词，即由两个以上的词组组成的短语，in front of, because of, out of, instead 如 of 等;还有一种二重介词，如 until after, from behind 等。
(一) 介词的句能：介词不能独立在句中做成份，介词后必须与名词、代词、或动名词构成介词短语在句中充当 一个成份，表示人、物、事件等与其它人、物、事件等之间的关系。
1、 作定语： The book on the table is mine.
2、 作状语： have breakfast at seven. We (表时间)They were late for meeting because of the heavy ; rain.(表原因) ;They started the machine by pressing the button.(表方法)
3、 作表语： My dictionary is in the bag.
4、 作宾语补足语： I found him in the office.
(二) 1.表示时间的介词
(1) in表示“在某一时间段”或“在某一时候”，如用在月、季、年份、时代、世纪等时间名词的前面，或用来泛指一天的`某一段时间。in也可以指“在……之后”，表示从说话起的若干时间内。
如： in July/summer/2022/ancient times
The bus will be here in ten minutes.
(2) on表示“在特定的某一天”，也可用于带有修饰语的一天的某个时间段之前。如：on Saturday, on Saturday morning, on the morning of August 1st
(3) at表示“在某一时间点”，或用来表示不确定的时间和短期的假日、时节等。
如：at six o'clock, at Easter
(4) over, through (out)两者均指“经过的全部时间”。
如：Stay over the Christmas.
(5) for与since：for表示动作或状态延续的全部时间长度，为“长达……”之意;since用于指从过去特定的某个时刻到说话时为止的一段时间;含有since时间短语的句子要用完成时，但含有for时间短语的句子不一定要用完成时。