【since】【since一般后面跟什么时态】_英语_死狗1u2i
编辑： admin 2017-15-06
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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）.例如：
I have been here since 1989. 1989起,我一直在这儿.
2）since +一段时间+ ago.例如：
I have been here since five months ago. 我在这儿,已经有五个月了.
3）since +从句.例如：
Great changes have taken place since you left. 你走后,变化可大了.
Great changes have taken place since we were here. 我们走后,变化可大了.
4）It is +一段时间+ since从句.例如：
It is two years since I became a postgraduate student. 我考上研究生有两年了.
其他同学给出的参考思路：
完成时
互助这道作业题的同学还参与了下面的作业题
题1： since后面什么时候跟完成时态,什么时候用过去时态?[英语科目]
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.（跟一般过去时）
Considerable time has elapsed since we have been here.（现在完成时）
4、It is +一段时间+ since从句
It is two years since I became a postgraduate student.（跟一般过去时）
题2： since前面加什么时态,后面又加什么时态?[英语科目]
since从句中用一般过去时,主句中用现在完成时.
如; He has published several books since he came here in 2009.
题3： since前用什么时态,后用什么时态[英语科目]
since前(即主句）用（ 现在完成）时态,后（从句）用（一般过去时）时态
如
He has worked here since he came to China.
题4： since前后该用什么时态啊?[英语科目]
since如果解释为“自从...以来”,引导时间状语从句时,则其前面的主句用现在完成时,其后的从句用一般过去时.
如：I‘ve made great progress in English since I came to this school.
自从我来到这个学校以来,我在英语上取得了巨大的进步.
题5： since用于哪些时态?（注意是时态）[英语科目]
① 现在完成时
He has been ill sunce last week.
② 一般现在时
Let's begin our meeting since everyone is here.