用if
if引導(dǎo)的從句表示“是否……”
whether有兩種用法,和or not的話是不能直接放在一起的
用whether的話全句應(yīng)該是
I don't know whether Jack finished his homework
或者在句末加個or not
I don't know .Did Jack finish his homework?(改賓語從句）
I don't know .Did Jack finish his homework?(改賓語從句）
I don't know _______ Jack finished his homework.怎么改?為什么?
I don't know _______ Jack finished his homework.怎么改?為什么?
英語人氣：828 ℃時間：2020-02-20 20:55:26
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