when do they must go to home和when are they must go to home?有什么不同?还是有个是错的?是不是must是助动词，do也是助动词，一句中不能出现两个助动词？这样对吗？

when must they go home对还是when do they must go home when do they must go to home和when are they must go to home?有什么不同?还是有个是错的?是不是must是助动词，do也是助动词，一句中不能出现两个助动词？这样对吗？ they like ice cream /Do they like ice cream?/What do they like?/They don’t like ice cream.the must go home now./ Must they go home now?/When must they go home?/They mustn’t go home now.这两段对话 为什么第一个用do 第二个不用呢? what do people need to take when they go out When do the girls go swimming?They usually----------------------------- when do they go to the zoo,what animals do they When you go to Rome,you must do as Romans do.可译为谚语--------- They must go home now .做句型转换They must go home now .变成一般疑问句,否定句,划线部分注：划线用when They must remember when they __(begin). when do you go When do they get When do they leave? what do people do when they go to the beach?用英文回答,不少于2句 When there is a green light,cars may go on.When there is a red light,cars must (s ).They must wait(u ) the red light changestogreen they must go home now的一般疑问句,否定句和以when开头的特殊疑问句 In most countries __________(全世界),children must go to school when they are five or six years-old What do peter and Jack meet when they go through a forest? What do peter and Jack meet when they go through a forest?