since怎么用

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since怎么用since怎么用since怎么用since要跟havebeendoing一起用~如:I''vebeenlookingformymp3since5am.since可以做连词~因为的意思~I

since怎么用
since怎么用

since怎么用
since要跟have been doing一起用~
如:I've been looking for my mp3 since 5 am.
since可以做连词~因为的意思~
I'm playing computer games,since there is nothing to do.
(句子是我现想的,不保证严密.)

副词:
1.以来

介词:
1.以来
2.自
3.打
4.自从

连词:
1.既
2.因为
3.既然
4.既是