- I have three sons who became a doctor.
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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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.