小学英语四种时态总结
小学英语四种时态总结
1． 一般现在时。主要描述经常会发生的动作、状态或不变的真理。句末常出现every day/week/year/Monday , in the morning, 句中常有always, usually, often, sometimes
组成：主语+be+名词（形容词）
      I am a student.            He is tall.
否定句：在be 后加not
      I am not a student.        He is not tall.
疑问句：be 动词提前到第一位。
      Are you a student?        Is he tall?
      Yes, I am. / No, I am not.Yes, he is. / No, he isn’t.
主语+动词+地点+时间
      We go to school on Monday.
      He goes to the park on Sunday.
否定句：主语+don’t/doesn’t’t+动词原形+地点+时间
      We don’t go to school on Monday.
      He doesn’t’t go to the park on Sunday.
疑问句：在句首加do或does
      Do you go to school on Monday?  Yes, we do./ No, we don’t.
      Does he go to the park on Sunday?  Yes, he does./ No, he doesn’t’t.
动词单三变化：1. 在原单词末尾加s , 如：like – likes
              2. 单词以o, sh, ch, s, x 结尾加es, 如：go – goes
              3. 单词末尾为辅音+y结尾去y加ies 如：study- studies
2. 现在进行时：主要叙述正在发生的事情。句末常出现now, 句首常出现look, listen
组成：主语+be +动词ing形式
    I am reading English.
    They are swimming.
    He is playing football.
否定句：在be后加not
I am not reading English.
They are not swimming.
He is not playing football.
疑问句：将be 放到第一位。
Are you reading English?  Yes, I am./ No, I am not.
clean的过去式
Are they swimming?      Yes, they are. / No, they aren’t.
Is he playing football?    Yes, he is. / No, he isn’t.
动词变ing形式：1.在动词末尾加ing. 如：play- playing
              2. 末尾有e 要去e加ing. 如：ride – riding
3. 末尾以辅音元音辅音结尾 双写末尾一个辅音如：swim-swimming
3. 一般将来时。 主要描述将来要发生的事情。
句末常出现next Monday/week/ year, tomorrow
组成：主语+be going to +动词原形
      I am going to visit Ann.
      They are going to draw a dog.
      She is going to ride a horse.
否定句：在be后加not
      I am not going to visit Ann.
      They are not going to draw a dog.
      She is going to ride a horse.
疑问句：将be提前
      Are you going to visit Ann?  Yes, I am. / No, I am not.
    Are they going to draw a dog?  Yes, they are./ No, they aren’t.
    Is she going to ride a horse?      Yes, she is. / No, she isn’t.
组成：主语+will+动词原形
      I will go to the library.
      They will clean the house.
      She will eat breakfast at home.
否定句：在will 后加not 或将will not 写为won’t
    I will not go to the library.
    They will not clean the house.
    She will mot eat breakfast at home.
疑问句：将will 提前
    Will you go to the library?  Yes, I will./ No, I won’t.
    Will they clean the house?    Yes, they will. / No, they won’t.
    Will she eat breakfast at home?  Yes, she will. /No, she won’t.
4．一般过去时：主要描述过去发生的事情. 句末常出现last night/week/Monday/year, yesterday, ago
组成：主语+动词过去式
      I was a pilot.
      They were busy.
      He went to the market.            否定句：在be后加not
第三单元  宇  宙 在普通动词前加didn’t 动词恢复原形。
6、你还知道哪些环境问题？它们都对地球造成了哪些影响？I was not a pilot.
答：可以，馒头中也含有淀粉，淀粉在咀嚼的过程中发生了变化，变得有甜味了。They were not busy.
答：我们在水中可发现变形虫、鼓藻、草履虫、船形硅藻等。He didn’t go to the market.
12、太阳是太阳系里唯一发光的恒星，直径是1400000千米。疑问句：提前be 动词或在句前加did
1、我们每天都要消耗食物和各种各样的生活用品，与此同时，也产生了许多垃圾。      Were you a pilot?  Yes, I was./ No, I wasn’t.
      Were they busy?  Yes, they were./ No, they weren’t.
21、人们发现银河系以外还有类似银河系一样庞大的恒星集团，如：仙女座星系、猎犬座星系，目前人类已发现了超过100亿个河外星系。      Did they go to the market?  Yes, they did. / No, they didn’t.
4、科学家研究表明昆虫头上的触角就是它们的“鼻子”，能分辨出各种气味，比人的鼻子灵敏得多。动词变过去式：1. 在原次末尾加ed 或d 如：play-played  like-liked
              2. 辅音加y 结尾去y加ied 如：study-studied
19、细胞也是生物最基本的功能单位，生物的呼吸、消化、排泄、生长、发育、繁殖、遗传等生命活动都是通过细胞进行的。              3. 辅音元音辅音结尾双写最后一个字母加ed 如：stop-stopped
2、昆虫种类繁多，分布很广，它们有着和其他动物不同的身体构造和本领。  特殊变化：can-could  do-did  eat-ate  go-went  hit-hit pit-put sit-sat come-came  get-got  have-had  see-saw  begin-began give-gave win-won read-read am/is-was are-were run-ran  hear-heard  hide-hid  lay-laid  cut-cut  wake-woke fall-fell
连系动词be是am, is, are三者的原形，一般不直接出现在句子中，而是以am, is, are的形式出现。它们各有分工，而且随着主语的人称和数的变化而变化。am最专一，始终跟着I转；are 跟you, we及表复数名词或复数意义的词连用；is的交际最广泛，is与“他、她、它”形影不离，至于名词单数，指示代词（this/that）都与is结下不解之缘。

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