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  ①in+月、年 the morning/afternoon/evening/a week 表示时间

  ②on+具体某一天(几月几日)/某个假期(…Day)

  ③at+具体某点时间、某个假期(…Festival)/the weekend

  ①in…street 表示方位

  ②on…road/left/right

  ③at the…crossing/stop/某个具体的地点

  ①in the tree(不是树上长出来的)

  ②on the tree(树上原来自己长出来的)

  表示时间:

  ① ago(……以前) later(……以后)

  ② before (在……以前) after(在 ……以后)

  be 动词和助动词

  1. be 动词(am/is/are)

  主语 be 动词(原形) be 动词(过去式)

  I am was He/she/it is was

  We/you/they are were

  2.助动词(do/does/did)

  Do+非第三人称单数 +动词原形…?

  …do/don't

  Does+第三人称单数

  …does/doesn't

  Did+所有主格

  …did/didn't

  What do you/they/we…

  +动词原形?

  I/They/We+动词原形…。

  What does he/she/it…

  He/She/It +(动词+S)….

  What did you/they/we/ he/she/it…

  I/They/We/ He/She/It +动词过去式。

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