since用法： 1）since+过去一个时间点（如具体的年、月、日期、钟点、1980，last month，half past six）。 2）since+一段时间+ago. 例如：I have been here since five months ago. 我在这儿，已经有五个月了。 3）since+从句。 例如：Great changes have taken place since you left. 你走后，变化可大了。 Great changes have taken place since we were here.我们走后，变化可大了。 4）It is+一段时间+since从句。 例如：It is two years since I became a postgraduate student. 我考上研究生有两年了。 上一篇：poetry可数吗 下一篇：车上list键是什么意思 |