英语语法贯穿整个英语的学习，准备英语六级考试的同学们还在为英语语法的学习而苦恼吗?本文介绍了since和for的用法，我们一起来看这篇2014年12月英语六级语法冲刺之特定句型吧!
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.
这篇2014年12月英语六级语法冲刺之特定句型就和大家分享到这里了，希望大家能够熟练掌握这两种句型!
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