unless后面一定是一般现在时吗?请帮忙举几个例子.

os-x 1年前 已收到1个回答 举报

htj520 幼苗

共回答了17个问题采纳率:94.1% 举报

不一定.例如:You can't go out to play unless you have finished your homework.,再如:You can't understand unless you were watching carefully.

1年前

9
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