All the questions areto be answered at once.(表示拟订的事情)
No one is to leave the room without the permissionof the police.(表示按职责必须做的事)
They are abouttoleavetonight.(错误,去掉tonight)
3.语境中的过去时,往往表示“刚才,刚刚”的意思,暗示现在已“不再这样”。如:
I didn’t know you were here.(说话时已经知道了你在这儿)
I never thought he would do that.(说话时已经知道了他会这样做)
4.表示愿望、打算一类的词,如hope,expect, mean,intend,want,think,suppose,want等,其过去完成时表示过去未曾实现的愿望或意图。如:
I had hoped to see more of New York.(实际上没能实现)I had mean to help you,but I Was too busy at that moment.(本来打算帮你,但没有实现) I had thought that he would come tomorrow.(结果是他明天不能来)
5.三个特殊句式的固定时态。
(1)This/It is the first/second…time+that从句。从句中一般用现在完成时,前面的is为Wa$时,贝0用过去完成时。如:
This is the first time I hare come to the famous city.
It was the forth time he had made the same mistake.
(2)It is/has been+一段时间+since从句o since从句中一般用一般过去时,如果前面是wag,则 since从句中用过去完成时。如:
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