Did you remember to buy oranges?我们老师让我们助动词用did,这句话为什么是过去式啊?

Did you remember to buy oranges?我们老师让我们助动词用did,这句话为什么是过去式啊? where did you buy yesterday 为什么buy不用过去式 which shop did you go to buy the fruit this morning?这句话哪里出错了 英语过去式什么意思比如 do you 和 did you 都是同一个意思,为什么是过去式?什么时候用过去式 I would rather they did not hear the news.这句话是虚拟用法 为什么要用过去式. Did you的后面动词要不要用过去式 l例如 Did you listened to music 另一个 Did yo I hardly believe what you said中倒装句的助动词为什么是did did you remember the news that i told you yesterday?这句话的结构对吗 Did you remember to return the digital camera to Sarah? did you remember to take the key to tom When did it start?为什么did用过去式? You'll be happy you did.这句话的意思是什么?为什么这里要用did的形式?