musten't是must过去式吗

musten't是must过去式吗 may是must的过去式吗? must有过去式吗 couldn't是过去式吗 改错 we Musten;t leaning out of the window. not的过去式是don't吗 过去式发音是t 英语提,十万火急1.Tommy,you ( ) play with the knife.You ( ) hurt yourselfA.won't ,can't B.musten't,may C.shouldn't,must D.can't shouldn't2.The only thing ( ) we should do is to go to bed earlierA.which B.that C.what D.it that't 有过去式吗 must 过去式是什么 must的过去式 求must的过去式 must的过去式是什么?水果是没有复数的. must的否定回答可以是mustn't吗 must have been在主句是一般过去式的宾语从句中变为must had been吗 ?两小时内给出答案 couldn't是can't的过去式吗couldn't的原型是can't吗?0 - 离问题结束还有 14 天 23 小时 couldn't的原型是can't吗?couldn't是过去式吗 can't be+v must be+v怎样表示,过去式呢,过去完成的呢? must的过去式是什么急