I don’t know ___________ he is well or not.whether/if,为什么?

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I don’t know ___________ he is well or not.whether/if,为什么?
I don’t know ___________ he is well or not.whether/if,为什么?

I don’t know ___________ he is well or not.whether/if,为什么?
我也刚正在研究这个问题,我得出的结论是：
whether ...or not
whether or not
if ...or not
都可以,只有if or not不行.
但是在考试中,就只把前两个看成是对的,就是只能说whether ...or not；whether or not,不能说if...or not,if or not.
所以在你这个句子里,只能填whether.

If it is true or not, I can’t tell. 3. whether可以引导带to的不whether 1. I asked her _ she had a bike. 2. We’re worried about

是对的啊。意思是我不知道他是否身体健康。

whether
if不可以与or not连用，没有or not可以用if，这里这个宾语从句只能选用whether

I don’t know whether he is well or not.
我不知道他是否好了。
whether or表示是否的意思。而if表达不出这种意思。
if连接词 conj.
1. (表示条件)如果
2. (表示虚拟)假如,要是
3. (表示让步)即使

I don't know his _______(话) 同义句转换:i don't know i've_____ _______.:i don't know i've_____ _______. i don't know what to say 同义句i _______ _______ _______ what to say I don't know how I can swim well.（改为简单句） I don't know ________ _______ _______well.I don't know how I can swim well.（改为简单句）I don't know ________ _______ _______well. I don't know. I don't know what shuold I do 的同义句是什么?I don't know _____ _______ _________ I don't know what I'm going to say at the meeting(改同义句)I don't know _______ _______ _______ at the meeting “i don't know you know i don't know I don't know where he _______ (hide) in the park.I can't find him 我不知道他为什么喜欢海豚：I don't know _______ _________ _________ _______. I don't know where I should go this afternoon.(改为同意句)I don't know _______ _______ _______this afternoon.爪机党手打不容易 I don’t know where the key is,but I suppose I _______ it at home. I know ______ is _______ brother,but I really don't like填单词 I don't know what I want _______(do).用正确形式填空 I don't know how _______(fly) the kite .I ask him______help(介) sorry,I don't know. i don`t know much I don't really know.