“what can they be doing”这句话中,怎么又有can又有be.我们老师说过当be是构成是时态时就是助动词,但是can也是助动词啊,一句话里怎么可以有两个助动词呢

What can't they do　还　 what they cant do? what can they do?的意思 What else can they do?同意句 同意句:what else can they do? What can they do at last? They can't decide what _______(do). What can they be的意思 他们可以做什么?翻译是 what can they do 还是what they can do? import export located in China what can they do and what can they not do import export located in China what can they do and what can they not do what can they do after they lose the way? .What can they do when they are biking? What (be) they ____(do)?They ________(play)checkers. --Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to doA must be told B has to be known what can they( they can play ( )table tennis.a do b play ; the c do;the What can your classmates do?What can not they do?Write sentences?翻译 what colour are they?回答是什么?what do they like eating?what can they do?doyour classmates like them too? they can do what they like句中what是什么意思,what在句中起什么作用