that 在宾语从句中没有意思是可省略的，其它的连词一般不可以省略，都表示一定的意思，否则，会造成句意不完整。如：I believe (that) he will come .that可以省略。I think that's an unwise policy.that不可以省略〉I don‘know why he isn't here now.(why不可省略)。t
