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谁能帮我看一下这句英语有没有错误

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谁能帮我看一下这句英语有没有错误
I'd buy this if it were cheaper.再便宜一点我就买.(这是我在爱词霸看到的,it是单数不是应该配is吗,就算是过去式应该也要配was吧.可是这里为什么用were 这句话有没有错误呢?
是假设现在,书面用法
If he were French,he would live in Paris.
If she were rich,she would buy a yacht.
I would play basketball if I were taller.
I would buy that computer if it were cheaper
口语可用 was