The teacher_(not teach)us a chinese song,he_(teach)us an english song two days ago.
问题描述：
The teacher_(not teach)us a chinese song,he_(teach)us an english song two days ago.
填什么?为什么?
答
didn't teach,taught
two days ago 表示：两天前,是过去时间,所以用一般过去时态.hasn't taught,taught和didn't teach, taught一样吗？它们有什么区别？hasn't taught 是用的现在完成时，didn't teach用的是一般过去时，这两者时态不一致。