新概念英语第二册49-04

He...follow me. C

A)don't need B)needn't to C)didn't need to D)needs

1.情态动词,无时态的人称

2.情态动词的疑问句的否定句都直接加not或提前

3.情态动词后加动词原形

needn't have done:过去不必做,但是做了 mustn't:不准 can't:不能 You don't...:事实

must苦恼等于have to表示必须,不等于have to时表示推测

1.对现在和将来加原形

2.对正在be doing

3.对过去have done

4.对过去正在have been doing

needn't＝don't have to

1.mustn't 2.mustn't 3.needn't 4.needn't 5.mustn't be bad for Smoking is bad for

you health

observe:仔细看