英语六级语法冲刺之特定句型
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.
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