问题: 时态
He had learned a lot since he came here.
这样说对吗？
had还是has还是都可以？为什么？
came还是comes?
解答:
He had learned a lot since he came here.
1.这样表达错误.
2.since引导的句子主句要用现在完成时,表示过去开始到现在对现在造成的影响.这里用came没有问题,因为来这动作已经发生了.
3.正确表达就是:He has learned a lot since he came here.
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