since表示“自从”的意思,在有since的句子中一定要用完成时,因为它强调的是从过去的某一时刻这个动作一直发生到现在,并对现在还有影响,这种情况符合现在完成时的用法,所以句子中才会用have taught,而你用的现在时进行时的要求是现在开始的动作,并正在做,没有停.所以,对比一下,你应该能看出来了.时态反应的是动作与动作之间发生的时间先后顺序,在一篇英语文章中起到很重要的作用,希望你能努力学好这一课
i am teaching in this school since i came here 为何这样不行呢?不能表示当
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