Is the seat taken?为什么用take的过去分词taken?在这里是什么时态?我怎么觉得语法讲不通?

Is this seat taken? is this seat taken中为什么用过去分词taken Is the seat taken?这句话怎么翻译?这句里包含什么语法? 'the seat is taking? excuse me ,do you know ----? __the man who was here finshed his lunch and left接上面.A.if the seat is taken B,when the seatis taken IS THIS SEAT TAKEN?如果说没有,怎么回答 英语翻译Is this seat taken?no,you can take it! Is the seat taken?为什么用take的过去分词taken?在这里是什么时态?我怎么觉得语法讲不通? this seat is free ,the other seat is takenTHE OTHER SEAT 换成OTHER SEAT可不可以?为什么? --Excuse me.Is this seat taken?--____.The man got books left a few minutes agoA I dont think so.B Never mind. The username is already taken her seat is in the s____ I beg your pardon.Is this seat taken?麻烦翻译一下 thanks Ladies and gentlemen,please fasten your seat belts.the plane has taken off By the time we got on the train,somebody had taken the last seat怎么改成被动语态? Excuse me,is this seat taken?--------.The man sitting here 2 minutes ago has just gone for somewater.A I don't think soB I'm afraid soC.I don't knowD I hope not ---Excuse me ,Is this seat taken?---_________,the man got his book and left a few minutes ago .A,I am afaid so B.I don't think so C.I don't know D.I hope so --Excuse me.Is this seat taken?--____.The man got books left a few minutes agoA.I'm afraid so.B.I don't knowC.I hope not题目记得不清,好象是这个