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I can do this one but am not sure about the other.

Can I say the sentence above? Or I have to say "...this one but I am not...", but using two I's seems a bit redundant, on the other hand omitting it seems a bit strange.

Can I add a comma?

I can do this one, but am not sure about the other.

Other than the grammar question, how to say this smoothly?

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    Stick with I'm in the second coordinate. That's the most natural and better-sounding option. – BillJ Feb 4 '17 at 13:30
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You need the subject, so I am is correct, but it is more colloquial to use I'm (because it flows better):

I can do this one, but I'm not sure about the other.

I am not saying that you can never omit the subject, but it would sound a little clunky in this case.

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I can do this one but am not sure about the other.

That sentence sounds perfectly acceptable to me. I am a native speaker of AmE, Central Atlantic region per D.A.R.E.

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