六级语法考点虽多，但万变不离其宗。掌握核心规则，轻松应对各种题型。下面小编为大家分享2025年12月六级语法：since的四种用法，希望对大家的备考有帮助!
2025年12月六级语法：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.
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