来自马桂芳的问题
Mr.Brownwillgofishingifit___(notrain)tomorrow.为什么不是isn'train?
Mr.Brownwillgofishingifit___(notrain)tomorrow.为什么不是isn'train?


Mr.Brownwillgofishingifit___(notrain)tomorrow.为什么不是isn'train?
Mr.Brownwillgofishingifit___(notrain)tomorrow.为什么不是isn'train?
rain本身就是动词,否定形式应该加助动词do,即doesn'train,而is是be动词,后面应该接名词或形容词等等,不能接动词