你好，同学
主句的
谓语动词是think,believe,imagine,suppose,consider,espect,fancy,guess等,并且主句的主语是第一人称而且为
一般现在时,从句的否定词一般要转移到主句上来,其
反义疑问句一般与
宾语从句一致.
I don’t think he will come to my party.而不能说成I think he won’t come to my party.
我认为他不会来我的舞会.
一、当主句谓语动词是think, believe, feel, guess, expect, suppose等表示“观点、信念、推测、臆测”等心理活动时，常常使用这种结构。
I don't think he has visited the island.
I don't expect it will rain tomorrow.
二、这种结构的
反意疑问句主语和谓语动词必须与宾语从句中的主语和谓语动词保持一致。
I don't think he is a good swimmer, is he?
I don’t believe that man is killed by Jim,is he?
我认为那个人不是Jim所杀的,是不是?
注意：否定前置只有第一人称需要前置，二三人称否定依然在从句中
例句：He thinks that she isn't fat.
希望能帮到你，祝更上一层楼O(∩_∩)O
有不明白的请继续追问(*^__^*)