English

1. I am sure that he will succeed.
2. I'm not sure that he will succeed.
3. I'm not sure if he will succeed.
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Are all grammatical? is 'that he...' a noun phrase or an adverbial phrase?

Is 'if he will...' a noun phrase or an adverbial phrase?

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4. I am sure (of) that he will succeed.
5. I'm not sure (of) that he will succeed.
6. I'm not sure (of) if he will succeed.

In each sentence, is 'the preposition 'of' missing?

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asked by rfvv

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