i am afraid not=i am afraid i not 还是=i am i afraid i can't
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i am afraid not=i am afraid i not 还是=i am i afraid i can't
i am afraid not=i am afraid i not 还是=i am i afraid i can't
i am afraid not=i am afraid i not 还是=i am i afraid i can't
准确地说应该是 I am afraid not to do = I am afraid (that) I can't do
【解析】be afraid 后面可以跟一下几种结构：
1、介词 of 短语,如：
He is afraid of his own shadow.（他连自己的影子都害怕.）
2、不定式短语（肯定式是 be afraid to do,否定式是be afraid not to do）.如：
I'm afraid to be late.我可能要迟到了.
I'm afraid not to be invited.我恐怕不会受到邀请.
3、that 引导的从句（that 可以省略）
I'm afraid (that) I'm wrong.恐怕我错了
I am afraid (that) you don't see my point.恐怕你还没有明白我的意思.
只要行为者既是 be afraid 的主语又是不定式的逻辑主语或从句的主语,不定式和从句是可以互相转换的.如：
不定式转换为从句——
肯定句：I'm afraid to be late 可以转换为 I'mafraid I’ll be late.我可能要迟到了.
否定句：I'm afraid not to be invited.可以转换为 I'm afraid I will/can not be invited.
从句转换为不定式——
肯定句：I'm afraid I’m wrong 可以转换为 I'm afraid to be wrong.
否定句：I am afraid (that) I don't see yourpoint 可以转换为I am afraid not to see your point.
至于从句中是用 do not、will not 还是can not/could not 需要视语境的情况而定.