“will Jimmy write a letter to me?” Grandmother asks Penny.“will Jimmy write a letter to me?”Grandmother asks Penny.直接引语变成间接引语,用if还是whether引导?还是必须用if?
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“will Jimmy write a letter to me?” Grandmother asks Penny.“will Jimmy write a letter to me?”Grandmother asks Penny.直接引语变成间接引语,用if还是whether引导?还是必须用if?
“will Jimmy write a letter to me?” Grandmother asks Penny.
“will Jimmy write a letter to me?”Grandmother asks Penny.直接引语变成间接引语,用if还是whether引导?还是必须用if?
“will Jimmy write a letter to me?” Grandmother asks Penny.“will Jimmy write a letter to me?”Grandmother asks Penny.直接引语变成间接引语,用if还是whether引导?还是必须用if?
两个都可以用
当陈述句表是否时 if与whether 没有区别
这边有if 与 whether的用法区别,你可以参考一下
一、引导宾语从句,一般既可用whether也可用if.但
1 or not放在whether之后时,只能用whether不用if.
I don’t know whether or not he will come. 我不知道他是不是回来.
注1:如果or not放在whether所引导的从句句尾,则可以用if来替换.
I don’t know whether/if he will come or not.我不知道他是不是回来.
2 在强调任意选择时,用whether…or,此时不用if替换whether.
He asked me whether I wanted to go there by train or by bus.他问我是想乘火车还是坐公共汽车去那里.
注:whether和or一起还有“不管”之意,引导让步状语从句.
Whether he drives or takes the train, he will be here on time.不管开车来还是乘火车来,他都会准时到.
3 虽引导宾语从句,但为了强调宾语部分,也可把从句放在句首,此时只用whether不用if.
Whether he will come I am not sure.他是不是来我拿不准.
4 从句作介词宾语时只用whether不用if.
It depends on whether it will be fine.那得看是不是晴天.
5 作discuss等动词的宾语时,用whether不用if.
We discussed whether we should close the shop.我们讨论是不是该关掉商店.
6 句子中有if引导的条件句,如再有表示“是否”的宾语从句,用whether不用if.
He asked me whether I’d move to New York if I got the job.他问我如果我得到那份工作是否会搬家到纽约.
7 容易产生歧义时用whether不用if来表示“是否”.
Please let me know if you need help. 如果你需要帮助请告诉我.或:请告诉我你是否需要帮助.对比:Please let me know if you need help.请告诉我你是否需要帮助.
8 如果宾语从句为否定句时,则只用if不用whether.
I don’t know if it won't rain tomorrow..我不知道明天是不是会下雨.
二、在引导主语从句、表语从句、同位语从句时一般用whether不用if.如:
⑴Whether it is true remains a question.(主语从句)那是不是真的还是个问题.
⑵The question is whether it is true.(表语从句)问题是是不是真的.
⑶We have a doubt whether it is true.(同位语从句) 我们怀疑那是不是真的.
注:whether引导主语从句放在主句之后时可用if来代替.
It is unclear whether/if he likes the present.他是不是喜欢那个礼物还不清楚.
三、用在动词不定式之前时用whether不用if.
I don’t know whether to go there at once. 我不知道是不是该立刻去那里.