1.they will come tomorrow if they are not prevented 为什么用if 不

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1.they will come tomorrow if they are not prevented 为什么用if 不用whether
2.we are to perform a new experiment this afternoon 可以把are to perform 换成will be to perform 3.can you tell me whom the dictionary belong to 的whom the dictionary belong to 换成whose dictionary belong to

1 if的意思是如果,含有假设的意思,引导的是条件状语从句,而whether的意思是是否,通常和not连用,意思是不管是……,所以不能用whether,如果有not的话还可以考虑一下,都没有not,所以都不用看了.
2 不可以,首先will和be to do的意思基本是一样的,合起来用就重复了,在这,this afternoon是一个比较近的时间,而be to do在表示时间远近的时候比will要近,所以用are to perform.
3 当然不可以,whose是一个疑问代词,谁的,而belong to 的意思是属于,首先从意思上看词典应该属于的是一个人,而不是一个代词,汉语说得话也只能说这个词典是谁的或者说这个词典属于谁,其次,belong to 后面应该跟的是somebody,所以不能换.

1.they will come tomorrow if they are not prevented 为什么用if 不 they will climb the hills if it -----(not ,rain)tomorrow They don't know if it ___ tomorrow.If it ___,they will not g They will go to see Mr.Li if they are free tomorrow.(保持原意) if they come,we will have a meeting(改为同义句 if they come,we () What will happen if she_______(not come) tomorrow? Do you know _____ or not they will come to zhe party?A.if B. They will go fishing if it----fine tomorrow A won They will have a basketball game if it () tomorrow ? If they are not careful,they ________________ a window. If will not have tomorrow . 1.If she () （not） come tomorrow,i will go to see her（适当形式）