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Article

Posted: Fri Nov 08, 2013 9:19 am
by Rustamsher
1. He has good knowledge of English grammar.
2. He has a good knowledge of English grammar.

In the two sentences is 'a' optional or compulsory?
If both are correct, is there any difference?

Thanks.

Re: Article

Posted: Sat Nov 09, 2013 12:51 am
by Alan
Obligatory.