比较whether与if 均为"是否"的意思。 但在下列情况下,只可用whether: 1. __ 。 eg:Whether he can come to the party on time depends on the traffic. 2. __ 。 eg:The question is whether we can get in touch with her. 3. __ 。eg:I am thinking about whether I should quit my present job. 4.if与whether都可以与or not 连用,但后面紧跟 __ 时只能用 __ 。 We didn't know whether or not she was ready.(此时只能用 __ )I wonder whether/if the news is true or not.(此时则二者都可以用) 5.后面直接跟 __ 时。 6. __ 可引导从句,作 __ 、 __ 、 __ 而if不行。