Mr.Brown will go fishing if it ___(not rain)tomorrow.为什么不是isn't rain?

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Mr.Brownwillgofishingifit___(notrain)tomorrow.为什么不是isn''train?Mr.Brownwillgofishingifit___(notrain)to

Mr.Brown will go fishing if it ___(not rain)tomorrow.为什么不是isn't rain?
Mr.Brown will go fishing if it ___(not rain)tomorrow.为什么不是isn't rain?

Mr.Brown will go fishing if it ___(not rain)tomorrow.为什么不是isn't rain?
rain本身就是动词,否定形式应该加助动词do,即doesn't rain,而is是be动词,后面应该接名词或形容词等等,不能接动词

用doesn't rain,
rain是动词,不可以和助动词is连起来用

doent rain
rain 是动词,不可和is连用