①in+月、年 the morning/afternoon/evening/a week 表示時間
②on+具體某一天(幾月幾日)/某個假期(…Day)
③at+具體某點時間、某個假期(…Festival)/the weekend
①in…street 表示方位
②on…road/left/right
③at the…crossing/stop/某個具體的地點
①in the tree(不是樹上長出來的)
②on the tree(樹上原來自己長出來的)
表示時間：
① ago(……以前) later(……以後)
② before (在……以前) after(在 ……以後)
be 動詞和助動詞
1. be 動詞(am/is/are)
主語 be 動詞(原形) be 動詞(過去式)
I am was He/she/it is was
We/you/they are were
2.助動詞(do/does/did)
Do+非第三人稱單數 +動詞原形…?
…do/don't
Does+第三人稱單數
…does/doesn't
Did+所有主格
…did/didn't
What do you/they/we…
+動詞原形?
I/They/We+動詞原形…。
What does he/she/it…
He/She/It +(動詞+S)….
What did you/they/we/ he/she/it…
I/They/We/ He/She/It +動詞過去式。
