Question

英语语法 I’m sure(that)和I’m not sure if/whether...

有急用 请高手给出尽可能详细的语法讲析！
如果附有例句等详细内容可以加分 主要是I’m not sure if/whether的用法和例句

Answer 1

I'm sure that you're very handsome!中文释义为“我确定你非常英俊”I'm sure意为“我确定。。。”或为“我坚信”。that引导后面的从句。
I’m not sure意思相反。
sure 是形容词，意为“肯定的，当然的”。常用来回答一般疑问句，等于 Yes或Certainly。sure的用法：

（1）be sure＋不定式。常用于祈使句，表示要求，意为“务必、请一定”。指外界的看法。例如：

I think he's coming, but I'm not quite sure.

Be sure to telephone me and give me all the news.

（2）be sure＋of或about。意为“相信，对……有把握”，后接名词、代词或动词的-ing形式。常用来表示“人对某事的看法”，指主观上的看法。例如：

Are you sure of that meeting? He is sure about this answer.

（3）be sure＋从句。表示“某人对……有把握”。例如：

I'm sure that he is coming to help me.

The teacher is sure that these books are interesting.

（4）make sure意为“务必、确信”，其后也可接of或about或动词不定式或that从句。例如：

I made sure (that) he was badly ill.

Will you make sure of his return?

Make sure to come to the party on time.

Answer 2

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。

Answer 3

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?

Answer 4

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.