if 和whether or not 能同时用吗?I don't think it matters if other people know whether or not buy a particular brand.帮忙分析下这句句子吧,它又有if,又有whether or not.原句buy a particular brand 前还有个“I”

if not和whether or的区别 whether 和if 的区别 .whether ...or not .一句话 whether or not可以完全换成if? if.or not的意思 whether or not呢? if.or not的意思whether or not呢? if 和whether or not 能同时用吗?I don't think it matters if other people know whether or not buy a particular brand.帮忙分析下这句句子吧,它又有if,又有whether or not.原句buy a particular brand 前还有个“I” He is very young.Iam not sure ____he can finish the work alone or not.A .how B .that C .whether D .if为什么不选D呀！短语有whether……or not,whether or not和if……or 有if……or not。whether或if均可表示“是否”的情况如 帮忙造八年级if和whether or not连接的宾语从句 if or not和weather or notShe tells me __my pictures are good or not.请问应填if 还是weather?为什么?打错了，是whether whether一定要和 or not连用吗. whether or的用法whether or not后跟什么时态wonder if后跟什么时态 whether 和 whether or not 有什么区别? 为什么if后面不能or not,whether可以 I don't know _________he will come or not tomorrow.________he come,I will tell you.a.if If b.if Whether c.whether If d.whether Whether whether ..or not... whether or not I don’t care ____ she has no money.I care____ she is honest or not.A.if…if B.whether…whether C.if…whether D.whether…if选哪个?个人感觉B和C都对呀 我知道第二个空填whether,至于第一个,感觉whether和if都可以 到底选 whether的用法whether...or not 的句型结构和if的句型结构意思是一样的,这里的or not 可以不可以省的呢?如：I don`t know whether he will go.