问if that what作宾语从句时，有何区别？

这个问题比较容统,不太好回答.不同的句子意思当然也不会相同.以下我将对宾语从句简单地说明一下:
1.作动词的宾语:
(1)由that引导的宾语从句 如:I hope that you can trust me.又如Our teacher says that the world is becoming a global village.
常跟that宾语从句的动词有:admit,agree,believe,confess(坦白,承认),decide,declare,expect,explain,feel,hear,hope,intend,
mean,order,purpose,remember,request,say,see,suggest,think等

在think,suppose,believe,presume(假使)dare等后时,that往往省略.
(2)由连接代词或副词what,when,where,which,who,whom,whether(if),how, why等引导的宾语从句
如:We don't konw what Tom will do next.又如:I wonder if I have made a mistake.

2.作介词的宾语:
介词后的宾语从句一般用连接代词和连接副词引导 如:I have no idea of how anxious she had been.
注意:介词后跟that引导的宾语从句只能在固定搭配中使用,常用的只有in that(因为),but that(要不是),except(save)that(除了...)等.
3.作形容词宾语
如:I am afraid (that) my father will be back soon.又如:We are not sure whether(if) we can find a better solution to this problem.
这类可跟that从句的形容词还有:anxious,certain,confident,determined(决定的)glad,proud,
surprise