What did you buy yesterday morning中,为什么buy后不能加on?急

what did you buy What did you buy last 连词成句yourself,did,buy,what,yesterday,you,for, What did you buy the watch for同义句 did what buy food you for Daming 怎么排列顺序 -----what did you buy,lingling?-----I__________an ice cream. What other things did you buy besides jujce?____ _____did you buy besides jujce? What did you buy yesterday morning中,为什么buy后不能加on?急 What were you bought yesterday.答案是what did you buy yesterday我是想知道为什么 what do you think he bought还是what do you think did he buy How did you know_____?A to buy what B to buy where C what to buy D where to buy 哪一个答案是对的,多谢. 把单词did What buy present you a for ?What要在最前面排成句子 where did you buy that? did you buy anything?翻译! did you b_____presents yesterday?------yes,i did. What did you buy in London? I didn't --- --- at allWhat did you buy in London?回答： I didn't （ ）（ ) at all What did you buy ______there books?A besideB expectC expectD besides what填空（其他的）did you buy in that shop?