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  1. I have three sons who became a doctor.
  2. I have three sons,who became a doctor.

    I want to know the difference between two sentences. Please, tell me the difference in meaning.

closed as off-topic by user3169, Nathan Tuggy, ColleenV, Peter, user24743 May 1 '16 at 4:23

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  • 3
    There is a number mismatch in both. If all three are doctors then you should use "who became doctors", not "a doctor". – laugh Apr 30 '16 at 22:00
  • Sometimes adding a comma can change the meaning of a sentence. That doesn't seem to be the case here, though. – J.R. May 1 '16 at 2:25
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Both the sentences are incorrect grammatically; you are referring to a plural noun 'sons' that must take the plural noun i.e. dictors. So the correct sentences are:

I have three sons who became doctors.

I have three sons, who became doctors.

As for the difference between these sentences, the clause without a comma before the relative clause "who became doctors" is a defining relative clause in the former sentence. It means that you have more than three doctors. Out of them, three became doctors.

The clause with a comma before the relative clause is a non defining relative clause. It indicates that you have only three sons; they all became doctors.

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