You can use either, in any combination.
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deepak chopI can use either, right?Yes. I'd prefer "a" in your examples, especially with "table", since these objects are rather too peripheral to be that specific, but it's not wrong if you use "the" either.
XerxesYes. I'd prefer "a" in your examples, especially with "table",Funnily enough, I'm the opposite. I'd be more likely to use "the" with "table" than with "gun". I believe this is because the table is a more expected object.
GPYFunnily enough, I'm the opposite. I'd be more likely to use "the" with "table" than with "gun". I believe this is because the table is a more expected object.Different strokes for different folks!