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if后跟的时态要依据主句决策。复合句中,主句是凡是改日时、祈使句或有情态动词,if后的从句要用如今时态。若主句是往日时,if后也要用往日的某种时态。

if后可接的时态

1.if开导的条目状语从句顶用平常此刻时态。开导条目状语从句,用平常此刻时代替异日时。

2.if后接夙昔时态

(1)第一种是与此刻本相一致,if从句谓语用过去式或许were。

(2)第二种是与从前事变一致,if从句谓语用从前完成时:had+从前分词。

(3)第三种是与未来畴昔实情一致,if从句谓语用动词过去式,should +动词事实,或were to+动词事实。

if双语例句

1.She gets very upset if I exclude her from anything

假如有甚么事项我不让她参与,她会特别很是忧郁。

2.He asked if I had left with you, and I said no

他问我是否和你一路摆脱的,我说不是。

3.Sometimes, that standard is quite difficult, if not impossible, to achieve

偶然即便有不妨到达谁人轨范,那也是十分难题。

4.If I could just make another small point about the weightlifters in the Olympics

请许诺我就相关奥运会举重运动员的问题再填充一点。

5.I wonder if you'd be kind enough to give us some information, please?

请教您能不能给我们供应部分新闻?

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