为什么it is three years since l came here前后时态不一致?什么时候since前后的时态

为什么it is three years since l came here前后时态不一致?什么时候since前后的时态必须一致
it is three years since l came here这句话since前后的时态为什么不一致?还有什么时候since前后的时态必须一致?

yuanyong7753 1年前已收到4个回答举报

wingwoocn 幼苗

共回答了18个问题采纳率：88.9% 举报

前面只是陈述一个已到三年的事实,不牵扯时态问题,而since后面的则需要更换过去时态,因为是叙述的来到这里的状态,而大多数时候,在含有since的主从复合句中,主句一般是用现在完成时,从句用一般过去时,

1年前

yaonv 幼苗

共回答了15个问题采纳率：80% 举报

这是现在完成时，过去完成时“is”改成“was”

1年前

fentun 花朵

共回答了23个问题采纳率：87% 举报

因为表示的是不同的时间，表示对过去的而不是现在的。

1年前

大Mr 幼苗

共回答了20个问题采纳率：95% 举报

这句话不对吧？这句话应该用完成时从我到这里至今已经有三年了

1年前

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