Did the children sing and dance together?肯定回答是什么? 就是用yes回答 yes后面加什么?是they did还是they‘re did?

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Did the children sing and dance together?肯定回答是什么?  就是用yes回答 yes后面加什么?是they did还是they‘re did?

Did the children sing and dance together?肯定回答是什么? 就是用yes回答 yes后面加什么?是they did还是they‘re did?
Did the children sing and dance together?肯定回答是什么? 就是用yes回答 yes后面加什么?是they did还是they‘re did?

Did the children sing and dance together?肯定回答是什么? 就是用yes回答 yes后面加什么?是they did还是they‘re did?
不能加are,如果在一个主语或代词候加is.am.are.was.were,都是be动词,do.does.did,是助动词,如果加be动词又加助动词那成什么了?
这句话里面dance是动词,所以加助动词,看到没?问句开头就是助动词,所以用助动词来回答.