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英语if引导的英语知识点 (1)if引导宾语从句和状语从句的区别 if引导宾语从句时意为“是否”，从句中该用什么时态就应用什么时态。 if引导条件状语从句时意为“假如”，从句中应用一般现在时代替一般将来时。 e.g.She wanted to know if you were a teacher. I don’t know if the letter is yours. They’ll go boating if it is fine tomorrow. I’ll give it to her if she comes next week. (2)if引导宾语从句时多数情况下可以与whether互换，但如果要突出“究竟是……还是不……”这层意思时，通常用whether，并在后面的加上“or not”，即一般要选择whether构成whether…or not的结构。 e.g.Please find out whether the money is his or not. Let me know whether you can come or not. I want to know whether you can help me or not. (责任编辑：admin) |