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I now have understood the sentence.

I have now understand the sentence.

Now, I have understand the sentence.

Please help me choose the correct one.
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Well, it should be understood in all sentences Emotion: smile

I don't think there's a correct or non-correct one; their use depends on the context. To me the first one sounds literary, the second one formal, and the third one "everyday English"
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In which case you are wrong. It does not need a comma.
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Hi,

You could also say, of course, the very common form, Now I understand the sentence.

Best wishes, Clive
Thank you Clive and Pieanne
CliveYou could also say, of course, the very common form, Now I understand the sentence.

Why you don't put the comma after the adverb `now'? Because I tend to do it.
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 Feebs11's reply was promoted to an answer.
None of your examples are correct grammar.

I have now understood the sentence.
Now I have understood the sentence.
Now I understand the sentence.