31.与现在完成时连用的两个时间状语

　　for+一段时间

　　since+时间点/一般过去时的句子

　　We have been studying English for three years.

　　我们三年来一直在学习英语。

　　He has been staying here since he was five years old.

　　自从五岁以来，他一直待在这里。

　　We haven’t seen each other since ten years ago.

　　自从十年前以来，我们一直没有见过彼此。

　　注意：for和since可以相互转换。

　　Jenny has been collecting coins for several years.=Jenny has been collecting coinss in ceseveral years ago.

　　珍妮收集硬币已经有几年的时间了。

　　32.除...…之外