作业帮I don't know __ he will come tomorrow.___he comes,I'll let you know.A.whether;if B.if;whether C.when;whether D.that;if请做答并解释,最好说一下相近词的区别和用法
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I don't know __ he will come tomorrow.___he comes,I'll let you know.A.whether;if B.if;whether C.when;whether D.that;if请做答并解释,最好说一下相近词的区别和用法
I don't know __ he will come tomorrow.___he comes,I'll let you know.
A.whether;if B.if;whether C.when;whether D.that;if
请做答并解释,最好说一下相近词的区别和用法
I don't know __ he will come tomorrow.___he comes,I'll let you know.A.whether;if B.if;whether C.when;whether D.that;if请做答并解释,最好说一下相近词的区别和用法
正确答案选A
第一个空格whether和if都可以使用,关键是第二个空格.
这里的if不是“是否”的意思,而是“如果”的意思.
关于whether和if都表示“是否”的意思的时候的区别如下：
whether和if都可以引导宾语从句,表示"是否",在口语或间接引语中两者可以互换使用.如：
I wonder if / whether I can get some advice from you.
Ask him whether / if he can come.
但在有些情况下,whether和if的用法有一定区别.
1.whether引导的从句常可以与连词or或or not直接连用,而if一般不能.如：
正：Let me know whether you can come or not.
误：Let me know if you can come or not.
2.当宾语从句提到句首时,只能用whether引导,而不能用if.如：
正：Whether it is true or not,I can't tell.
误：If it is true or not,I can't tell.
3.whether可以引导带to的不定式,if则不能.如：
正：I don't know whether to accept or refuse.
误：I don't know if to accept or refuse.
4.whether及其引导的成分可放于介词之后,作介词的宾语,但if不能.如：
正：I worry about whether I hurt her feelings.
误：I worry about if I hurt her feelings.
5.whether可以引导从句,作主语、表语或同位语,而if不能.如：
正：It was uncertain whether he would come.
误：It was uncertain if he would come.
正：His first question was whether Tom had arrived yet.
误：His first question was if Tom had arrived yet.
正：We must consider the question whether we will take these measures.
误：We must consider the question if we will take these measures.
A
否定时一般用whether，不过不正式的场合其实用if也行
A
我不知道明天他是否会来，如果他来了，我会告诉你。
后一个空只能填IF
前一个可以填if或 whether，因此选A。
很高兴为您回答问题
该题应该选择A项
区别：
通常情况下whether用于否定句和疑问句里，译为是否；而if则用于肯定句，译为如果、假使。
希望我的回答对您有所帮助！
A
如果后面有or not 那一定是whether
一般if后面会跟条件，如果怎么样，就会怎么样。
A.whether;if B.if;whether C.when;whether D.that;if A