since，英语单词，副词 ad（常用于现在完成时或过去完成时），介词 prep.（常用于现在完成时或过去完成时）自……以来，从……至今，自从，连接词conj。接下来，让我们一起学习五年级英语since的四种用法。

五年级英语since的四种用法总结

1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。

I have been here since 1989.

2) since +一段时间+ ago

I have been here since five months ago.

3) since +从句

Great changes have taken place since you left.

Considerable time has elapsed since we have been here.

4) It is +一段时间+ since从句

It is two years since I became a postgraduate student

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