【摘要】掌握好英语语法对于同学们学好英语有很重要的作用，小编为大家整理了英语六级语法：特定句型知识点，希望大家喜欢。
since和for的用法：
since 用来说明动作起始时间，for用来说明动作延续时间长度;
eg：I have lived here for more than twenty years.
I have lived here since I was born.
for后面多接一段时间，而since后面则接一个时间点，若since后面也出现时间段，则在时间段后加ago;
eg： I have lived here for twenty years ago.
错句：I have worked here since twenty years.
since句型：
It is +一段时间+ since从句，since从句要用一般过去时;
eg：It is two years since I became a postgraduate student.
【总结】英语六级语法：特定句型知识点就为大家介绍到这儿了，希望对大家有帮助，更多精彩内容尽在精品学习网。
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