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have since been 和 have been since

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have since been 和 have been since
have since been 和 have been since
应该是二者的词性不同吧：have since been 中的since是副词,修饰have been.
但是have been since中的since是个连词,它后面必须要接点什么东西.
eg：the building has since been under constuction .
the building has been under construction since 2009.(接了时间点）
have done for/since和have been doing for/since区别 have been here 后面可不可以用since I HAVE BEEN HERE SINCE TIME 2.We have been friends since ______. i have been skating since nine years they have been here since 2000 I have been busy since yesterday. I have been here since I was born 和I haden't seen him since have gone to/have been to和have been in能不能与for.since连用 可以用于现在 I have been sick since yesterday.中have been 是什么是时态为什么要用been. I have been in CZ since last year.这话对么?been in后可加since吗 I have lived here since then还是I have been here since then对啊?