① 表示与现在事实相反的情况:主语+should/would/could/might+do+其他if+主语+did/be(were)+其他eg.If I were you,I would take an umbrella.如果我是你,我会带把伞.(事实:我不可能是你)②表示与过去事实相反的...
① 表示与现在事实相反的情况:主语+should/would/could/might+do+其他if+主语+did/be(were)+其他eg.If I were you,I would take an umbrella.如果我是你,我会带把伞.(事实:我不可能是你)②表示与过去事实相反的...