改错When did Tom does his homework?我改成了When did Tom doing his

When did Tom doing his homework? 根本就是错的,没有这种用法的.陈述句变成了疑问句,加进了助动词(do, did, does)谓语动词都要还原的,就是还原成原型.所以上面两句都是错误的.When did Tom do his homework? 正确.再举两个例子：Tom goes to school by bike every day. - Does Tom go to school by bike every day. - How does Tom go to school every day?一般过去式的也一样：Jack liked to eat apples. - Did Jack like to eat apples? -Why did Jack like to eat apples?不懂再追问,希望您能满意.

改错When did Tom does his homework？我改成了When did Tom do his homework？这里要用动词原形，因为前面的有助动词了。书上正确答案是When did Tom do his homework？do his homework和doing his homework在本句中有什么区别？我的回答对吗？doing his homework没有这种用法，除非...

原因很简单，助动词did加主语加动词的原形，记住就是了。

你的回答当然不对啦！书上的对。如Does he like swimming？一样的。did是过去式助动词，后面的实义动词要用动词原形。明白了吗？