题目 举报since后面什么时候跟完成时态，什么时候用过去时态？扫码下载作业帮搜索答疑一搜即得

答案解析 查看更多优质解析解答一举报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)。 I have been here since 1989. 2、since +一段时间+ ago I have been here since five months ago. 3、since +从句 Great changes have taken place since you left.（跟一般过去时） Considerable time has elapsed since we have been here.（现在完成时） 4、It is +一段时间+ since从句 It is two years since I became a postgraduate student.（跟一般过去时）解析看不懂？免费查看同类题视频解析查看解答二维码

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