Question

I was not sure whether he would agree. (Make it affirmative)

Answer 1

Answer:

I was sure he would agree

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Answer 2

Answer:

I was unsure whether he would agree.

Explanation:

When asked to make a negative sentence into affirmative, try to lookout for the word that makes the sentence negative.

Once you  find that, replace it with its antonym.

Here, the negation was due to the word 'not sure' so it is replaced by its antonym 'unsure'

Hope this Helps.