当句中有BE 动词,情态动词或助动词时,疑问词后就接这些词,否则就要加DO , DOES （ 一般现在时第三人称单数） 或DID （ 一般过去时） .如
He can swim ->What can he do ?
He finishedhis homwork two hours ago .-> What did he do two hours ago ?
He is a student .->What is he ?/Who is a student ?
They often play basketball after school ?-> When do they often play basketball ?
Lucy comes from America .->Where does Lucy come from ?
加油!不明白再问!如果帮到你,请采纳,谢谢!那划线后面接的是动词原形还是与上面的句子一样的？？是如果是助动词的话，后面接的是动词原形吗不是很明白第一句你问的是什么意思？如果是助动词的话，后面接的是动词原形