为什么it seems as if=it looked as if而不是looks

为什么it seems as if=it looked as if而不是looks It looks as if it___tomorrow. It seems as if he were an expert 为什么谓语动词要用were 而不是was It seems as if it----rain. it seems as if they know everything It seems as if从句怎么用 it seems that 和 it seems as if的区别 It seems that 和It seems as if区别 it seems as if 和it seems that的区别 it seems that和it seems as if的区别? it looks as if she 's It seems as if it is going to rain中为什么要用个if