what/that 和 if/whether怎么区别?
来源:百度知道 编辑:UC知道 时间:2024/09/22 17:29:37
如题, 希望可以举例
what/that在分句中的用法你最好找一下参考书,不是一句两句能说明白的。
if/whether 好区别,能用whether的地方都能用if,但有时用whether能更直接的得到结果,因为给whether作答的时候只能说yes或no。在whether的问句后边有时加or not,暗示回答者只需要回答,yes或no。
例,
Do you know whether it rained last night?
你知道昨晚下没下雨?
答案有3种情况:1. I don't know whether it rained or not. 我根本就不知道。 2. Yes, it rained. 我知道,下了。 3. No,it did not. 我知道,没下。
比较一下用if的情况
Do you know if it rained last night?
答案可以不定,被问者说点儿什么都可以。
1. I don't know; it might have. 我不知道,有可能下了。
2. It wasn't raining when I left work. 我下班时候还没下。
3. Yes, it was pouring last night. 昨晚瓢泼大雨。
总之,不用非要回答下或没下。
总结,如果你想得到一个是,或不是的答案,而且问题本身可以被缩小为只有两个答案的时候,用whether。 随便问问,用if。
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