2018长沙五年级英语下册语法知识点：since的用法
导读：since作连词，指“时间”，表示“自......以来”。Since引导时间状语从句， 表示主句的动作，从过去的某一点时间持续到现在，从名时态常用一般过去时，主句的时态一般用现在完成时。句型“It is ...since...",表示从过去某一点时间，持续到现在的整段时间。since还有哪些用法?下面是五年级英语下册Since用法的归纳与汇总，供同学们参考学习。
since的用法
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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导读：since作连词，指“时间”，表示“自......以来”。Since引导时间状语从句， 表示主句的动作，从过去的某一点时间持续到现在，从名时态常用一般过去时，主句的时态一般用现在完成时。句型“It is ...since...",表示从过去某一点时间，持续到现在的整段时间。since还有哪些用法?下面是五年级英语下册Since用法的归纳与汇总，供同学们参考学习。
since的用法
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
延伸阅读：
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