I'm not sure--------he will come tomorrow.中间为什么不能用whether来连接

I'm not sure--------he will come tomorrow.中间为什么不能用whether来连接 四道英语选择,1.____ whether he will come or not.【D】A.I’m sure B.I’ I'm sure that he will come back tomorrow中的that he will come改 I am not sure wether he will come back soon?whether引导的是什么从句? I'm sure he will come tomorrow.的同义句：He is____ ____ ____tomor I'm sure he will come tomorrow.(同义句）He is ______ ______ ____ are you sure __ simon will come tomorrow?yes,but i'm not sur He will come tomorrow.I am sure 合成一句 I don't know < >he will come tomorrow or not 括号中该填whether还是i 5.I’m not sure___ he will come back home tomorrow or not.A.i I am sure (it) will be fine tomorrow 中的It 为什么不能用there替换? M---- he will come,but I'm not sure.A--- her grandmother is