While the children have fun,parents can take dance lessons on the beach 为什么have不用加ing顺便讲讲while的用法行么?while后面能加什么?

while he___(write)on the blackboard,the children ____(talk). While the children were playing in the garden,their mother___(cook)in the kitchen,在线等 While the children have fun,parents can take dance lesson on the beach.为什么用while而不用when? most of the children are playing,while some are still doing their homeworkmost of the children ______ ______,while some are still doing their homework the children have fun,parents can take dance lessons on the beachA when B while The food children eat while watching TV makes the problem more serious.的中文. These single parents must care for the children`s emotional needs while supporting them_______financially 还是finance? _______(When/While) Marry was writing a letter ,the children were playing outside. then does into children's rooms while they are_______puts present in the stockings 英语翻译People today are still talking about the generation gap(代沟J) .Some parents complain that their children do not show them proper respect,while children complain that their parents do not understand them at all.What has gone wrong?Why h while the The children chortled all the time while they were hearing the story.The children were chortling all the time while they were hearing the story.The children chortled all the time while they heard the story.怎么就不行？语法不对吗？还是 While he was writing on the blackboard,the children talked/were talking.为什么是过去进行时?　为啥不是　While he is writing on the blackboard,the children aretalking. The children. The children While the children have fun,parents can take dance lessons on the beach.中have为什么是原形? 这句英文有错吗?while the most of children like snow but the most of adults hate it While the children have fun,parents can take dance lessons on the beach 为什么have不用加ing?