在英语六级学习或者考试中，语法部分始终是一切的基础。接下来小编给大家分享2023下半年大学英语六级基础语法知识：since，希望对大家有所帮助!
2023下半年大学英语六级基础语法知识：since
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.
以上是新东方在线六级语法频道为考生整理的“2023下半年大学英语六级基础语法知识：since”相关内容，预祝大家都能取得好成绩!