since的问题

liuxin8521623 - 试用期 一级 9-3 20:21
的句子有点儿问题

have to stay at home since I've caught a cold.

下面那个倒不错
呵呵~~~~

I have to stay at home since I'm catch a cold.

Since everyone has come, we can start the meeting now.
since做由于的意思时,表示一种显而易见众所周知的原因.
Since it is raining, we have to put off the meeting.