must be do与must be doing 区别

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mustbedo与mustbedoing区别mustbedo与mustbedoing区别mustbedo与mustbedoing区别mustbedo是不存在的.要么mustdosth,或mustbe.

must be do与must be doing 区别
must be do与must be doing 区别

must be do与must be doing 区别
must be do 是不存在的.要么must do sth,或must be.(表示一般情况或状态）
must be doing ...肯定正在做.(表示现在正在.)

must be doing：表示对现在的推测
must be sb doing：必须将某人做
Must be doing something：必须做某事
没有must be do这个词！！
望采纳！！

must be do是错误说法，应为must be done .区别是：前者是一定做了，后者是一定在做。两者都表示推测。

must be do与must be doing 区别 ( )your homework ____by yourselves.A.must be do B.must do C.must be does D.do( )your homework ____by yourselves.A.must be do B.must do C.must be done D.do 是must be to do还是must be doing must be what must be must be! may be 与must be区别. SO DO I,YOU MUST BE HAPPY what must you do to be safe? Told myself do everything must be must be happy must be young must be beautiful What should ____ must ____.A do,do B be done,be done C to be done ,do D do,be done When____the work,you must be careful.A do B are doing C to do D doing belong to与must be区别 must be 同义词 must be后面是动原吗 must be后面是动原吗 It Must Be?歌词 You must be strong .