1分别用for短语, since短语或从句造句 用现在完成时 2用that is why造句

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1分别用for短语, since短语或从句造句 用现在完成时 2用that is why造句
1分别用for短语, since短语或从句造句 用现在完成时 2用that is why造句

1分别用for短语, since短语或从句造句 用现在完成时 2用that is why造句
I have been here for 3 years.for延续,加时间段.
I have been here since 2009.since加时间点.
that is why 是主语从句中的表语从句.That is why i come here.这就是我来这的原因.

1.They have studied here for over two years .
He has worked here for ten years .
We have been friends since for years ago .
Lucy has had her new walkman since she bought it three weeks ago .
2.That is why I came late .
That is why I dislike maths .

1,i have been there for a long time. i have been there since 1999
2.that is why i want to call on hhim

i have lived here for three years.
i have lived here since three years ago.
that is why i want to go home.