I think he can‘t swim.和I don’t think he can swim.有区别么?think什

如果主句的谓语动词是think,believe,suppose,expect,guess,fancy,feel,imagine等表示“观点、信念、推测”等心理活动的动词时,否定谓语从句的not往往转移到主句,成为“形式否定主句,意义否定从句”,这种语法现象就叫做否定转移.如：
I don’t think he will come this afternoon.
我认为他今天下午不会来.
主句中的谓语动词若与情态动词或状语连用时,不转移否定.
I can’t believe that they are married.
我真不敢相信他们结婚了.
动词hope不可进行否定转移.
I hope it won’t snow.
我希望天不下雨.
否定前移这个知识点在中学阶段很重要,一定要记住千万别忘了!