英语常见时态(5)

1）I haven’t been there for five years.

2）So far, she hasn’t enjoyed the summer vacation.

3）There have been a lot of changes since 1978.

（3）完成时态可用在下列结构中：

This (That, It) is (was) the first (second…) time +定语从句；This (That, It) is (was) the only (last) + n +定语从句；This (That, It) is (was) +形容词最高级+ n +定语从句。如果主句的谓语动词是一般现在时，从句的谓语动词通常用现在完成时；如果主句谓语动词是一般过去时，从句谓语动词通常用过去完成时。例如：

（1）This is one of the rarest questions that have ever been raised at such a meeting.

（2）There was a knock at the door. It was the second time someone had interrupted

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