Dear N T:

You wrote:
> Are these sentences correct:
> 1-Those two men John and Harry are friends of mine.
> 2-These two books “War and Peace” and “Anna Karenina” are Tolstoy’s best
> novels.
>
They are grammatically correct but the appositives need to be set off by commas or dashes. Because the subjects use demonstrative adjectives, the dashes would make the meaning clearer to the reader.

Those two men–John and Harry–are friends of mine.