Question

I can do no more make affirmative

Answer 1

I am unable to do more

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Answer 2

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The sentence you offer doesn’t make any sense if you put a question mark at the end. Why would you ask someone else if you’re sure or not? Only you know.

If you want to make a statement, you would say, “I’m not so sure now.” That means “Initially, I didn’t have any doubts, but now I do.’

If you want to write the sentence and avoid the use of “not,” you can say “I’m unsure now.” Technically, you have an affirmative sentence because you’re not negating the verb, but the meaning is the same because you’re using the prefix “un-” to make the adjective have a negative value.

If you need to phrase it as a question, you could say: “I’m not so sure now, am I?” Or, “Am I sure now?” In both cases, I think it’s a rhetorical question because you’re not really expecting an answer. The other person has no way to know if you’re sure or not.