英语六级基础语法：since的用法

　　语法是学习一门语言的基础,只有掌握了语法，才能更好的去学习新的结构，也才能更加轻松的学习，所以，今天课窝小编为大家整理了英语六级基础语法，希望对你有所帮助。

　　英语六级基础语法知识：since的四种用法

　　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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