must
1. 表必要性: [必要] = have to (語氣上沒有must強)
I must go now.
=I have to go now.
否定: must not / don't (doesn't) have to
過去式: had to (有的老師會說must沒有過去式)
2. 表推測: [必定]
You must be thirsty now, drink some water
句型補充
must have + pp - 過去某人(事)ㄧ定是怎麼了
e.g. You just have been eaten too much.
He didn't come. He must have forgotten it.
had better + V - 最好~~
常與主詞縮寫 (I'd better, You'd better, He'd better...)
e.g. You'd better finish your homework, or you won't get any grade.
You'd better go to bed now, because you need to get up early tomorrow
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