since \\in \\during在表示时间时的区别?

问题描述:

since \\in \\during在表示时间时的区别?
since \in \during在表示时间时的区别?
是加时间段还是时间点?
时态是怎么区别的?

since:加时间点,一般用现在完成时,since two years agoin:时间段,一般将来时,I will go in two yearsduring:加时间段,时态不定,看语镜,during two yearsPS:since/for可以互换:I have been here since two years ago=...