第1个回答 2009-12-27
i'm sure that you're a good man.既然我确定了,就必须是肯定句,确定某件事实。陈述语气。
i'm not (that) if you like it.=i'm not sure whether you like it.=i'm not sure whether or not you like it.不确定,后面就跟不肯定的内容,if和whether相同,都是“是不是”的意思,不确定,需要选择。
第2个回答 2009-12-27
I'm sure that +从句(确信的内容),如I'm sure that he will come.我确信他将会来。I'm not sure if/whether意思为我不确信是否…,从句本应为一般疑问句。如I'm not sure if he will come.不确信的内容本为will he come?
第3个回答 2009-12-27
后接陈述句时,分两种情况。I’m sure that...后面用肯定句,且that可以省略;I’m not sure if/whether...后面用否定句,if/whether不可省略。如:
1.I am sure (that) they can win the game against Class 4.
2.I am not sure if/whether they can win the game agaist Class 4.