since when do you guys know each other为什么不用过去式这什么这个地方不用过去式,

翻译一句话：Since when do you make mistakes? since when did/do you become so diligent是did 还是do?为啥 since when do you guys know each other为什么不用过去式这什么这个地方不用过去式, You must do it____ the manager told you.A.when B.as C.though D.since 请问正确答案及理由. Since when have you become active?翻译 when do you come when do you arrive when do you go When do you apologize? When do you live? When do you apologize? when do you see? How long do you think it will be ______ the economy revives?A.after B.since C.before D.when --Since when ________ each other --Oh I can't remember.A.did you know B.do you know C.you know D.have you known this is a revision paper .When you do it,you'd better make a mark ____ you have questionA.whereB.the placeC.as ifD.since since when When能否对完成时提问?When能否对完成时提问?以下句子是否正确?：1）When have you learnt English since 2) When had you learnt English 3) When have you started to do it 4) When had you started to do it 二楼的，对此我想说 When do you eat dinner?When do you eat dinner?