解释一下该句子的时态Since he came here last year, we have been happy.解释一下主句和从句之间时态的判断.
问题描述：
解释一下该句子的时态
Since he came here last year, we have been happy.
解释一下主句和从句之间时态的判断.
答
这是一个现代完成时句子.我便一下你就明白了：We have been happy since he came here last year.自从他去年来这,我们很高兴.句子解析为：主语（we）+have/has+过去分词（been）+since+时间点（ he came here last y...