新概念英语第二册第三课课后练习选择题第四个4.----- him a few words of Italian?The

新概念英语第二册第三课课后练习选择题第四个4._____ him a few words of Italian?The waiter.为什么要选择Who taught而不是Who did teach.第五个5.He was a friendly waiter.He spoke to the writer_____.为什么用in a friendly way而不是like friends.谢谢你们了,我是一个人自学,有一些问题不懂.
那加过去式did,为什么就不行呢?