Student or Learner
I am a bit confuse when to use "the"... despite I knew that for the one which is definte and firm to say , we have to use "the".
So, of the following which one is correct to write
1) I apologies for the late reply.
2) I apologies for late reply.
Similarly in the sentense
"Here are the details requested by you" - Is it proper to write/say ?
Is it right to write "a data" or "the data" ..?
As their names imply, use the definite article (the) when you are referring to something definite. On the other hand, the indefinite article (a/an) is used for generic reference. This rule does not always hold true, mind.
I did not study the use of articles from books. I play them by ears.
1) I apologise/apologize for the (=my being late at hand, now - definite) late reply.
2) I apologise/apologize for late reply.
"Here are the details requested by you"
the details that you requested - specific
Is it right to write "a data" or "the data" ..? -- It depends on what you want to say. The context determines which article is to be used.