zongwenzheng
@zongwenzheng
For example: I bought a book – book is a singular, countable noun; therefore it has to have an article. Your reader does not know which book you are referring to, therefore it is ‘indefinite’. The book I bought is interesting - book is again a singular, countable noun; therefore it has to have an article. In this case, we know which book you are referring to (the book you bought), so it takes a definite article. (More details on the definite article are given below.) I like the books you gave me – books is a plural noun. It is used in a definite sense (we know which books – the books you gave me), so it takes a definite article.
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