MUST DE LEAVING NOW

MUST DE LEAVING NOW i must be leaving now这句话是什么时态 为什么be后用leaving we are leaving now. 英语句子判断请问哪位老师知道：I must leaving now.的对错.还有解析---------急用!两小时之内! Now there are fewer pandas_________.We must do something right awayA.left B.leaving C.lived D.live I had better _______ now.(leave leaving) must be leaving 和must leave 的区别 Are you leaving now?还是Are you leave now workers are leaving now .还是workers leave now I’ll be leaving now.请问这句和I'll leave now.I'm leaving now.有什么区别? leaving leaving leaving I must go now 还是 I must going now 1.Students__（can/must)finish their homework on time.its a rule 2.The train is leaving.I amafraid I__(can/have to)go now.3.Jessica is a good student.She__(usually/never) gets to school early sorry,I must be leaving now,because there's a meetingA.No,you won't B.Yes,you canleave as you likeC.do you really have to go?couldn't you at least stay for an other cup of tea? We must l now.Goodbye. Now you must have lunch.