joking.must.he.have.I.was.thought 连词成句

joking.must.he.have.I.was.thought 连词成句 Jack must have been joking when he said that he was going to quit his job.为什么用when用what不行吗 You must be joking Look:Jack is putting on his hat and coat.He must (be going) out.请问这里的be going能否改成go呢?有什么区别呢?结构must+be+doing/coming/joking等must+do/go/know/have等 you must be joking,救命 变反意疑问句You must be joking,_____? joking 反义疑问句该用哪个动词提问?句中并没出现IS,ARE,DID,DO这些?比如：I have to go now,don't 为什么是DON'T?You must be joking now,aren't you?为什么是AREN'T?He might be sleeping just now,wasn't he?没有WAS出现呀?It must ha you must (be joking)为什么要用(be joking),用joke行吗? Everyone thought he was joking,but in fact he was serious.为什么用was joking He must have done nothing but ____ you do not underest ,you must be joking He looks tired,he _______ too little sleep.A must have had B must have C must have been is it he must have fallen or he must have fell?whythank you He must have been ill,___ he?如何变反意疑问句 He can't find his key.He ---------- them.A.must lost B.must have been lost C.must have lost 句:You must (be joking).(be joking)能换成(play jokes) 如果不能,那么能换成什么短语? must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be