英语四六级考试中,单独考察语法的题型不多,但是语法知识点却贯穿整张试卷,小伙伴们,趁着寒假,赶紧来打好基础吧! since的四种用法
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)。
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.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student. 编辑推荐: 2015年12月英语四六级成绩查询全解析专题 英语四六级听力改革详解及备考策略解读 各地2015年12月英语四六级考试成绩查询时间及入口 2015年12月英语四六级真题答案解析专题