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murongruo
It is + 段时间 + since... / It has been + 段时间 + since...表示“从……起已有多长时间了”。两句型意思相同, 前者是规范说法, 后者是口语说法。 用法:since从句中常用一般过去时,若从句中是持续性动词的一般过去时, 则表示该动作结束有多长时间了。如: It is three years since he smoked. 他不吸烟已有3年了。 试比较: It is three years since he began to smoke. It is three years since he has smoked. 两句均意为:他吸烟已有3年了。 你原句 如果是 since I began to work here 就是 一直在教的意思了