I have been up since two hours ago.为什么这句话是对的?现在完成时不是不能跟过不是不能跟过去的时间连用吗?

I HAVE BEEN HERE SINCE TIME i have been skating since nine years have since been 和 have been since 英语翻译it's been so long since i have had sex,i have forgotten who ties up who.希望得到翻译 I have lived here since then还是I have been here since then对啊? 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 been collected shells since Isaw her.和I have been collecting shells since I saw her哪个对? I have been studying English since I was five (对since I was five提问) 句子改错：I (A.have been) (B.learning) English (C.since) I (D.have been) ten. 求翻译I have been going regularly ever since then. I have already been to Japan t______ since 2001 i have been here ( )a year.A,since B,for I have been here since three yeas ago Since he left after I have been looking for living. I have been ----(想念)him since he left. have .since did区别have .since have done?eg：I haven’t seen you since I’ve been back.I haven’t seen you since I was back. 请帮忙分析语法I have been trying to think up a gool slogan,and since you've been such a big inspiration to the people around you.since之后为什么用过去完成时?