which one is correct?

She's on a beach, if you know she is on some sort of beach but you don't know which one

She's on the beach, if you are refering to a specific beach

:)

Both are correct. They depend on context. Using "the beach" implies either that we are referring to a specific beach or that we are interested more in the act of being on the beach rather than which beach. Using "A beach" implies we don't know where she is - she could be anywhere, somewhere in the world!

The are both correct depending on how or what the context of the story is about for example. She's on the Beach some where in Hawii, Now if you are near the beach she is on you would say She's on the Beach.

grammatically both sentances are correct. It just matters what context they are used in.

EXAMPLE 1:

A, B and C are on holiday at a hotel in hawaii. They are staying by a lovely beach.

Person A asks person B "where is C"

Person B says "she is on the beach"

You would say "the" beach because you are reffering to one specific beach.

EXAMPLE 2:

Person A has gone on vacation. Person B and C (A's friends) are talking about C.

Person B asks "What do you think A is doing right now?"

Person C says "I think A is on a beach sunbathing"

You would say "a" beach because you aren't reffering to any beach in particular, you could be talking about any beach in the world.

See they both work.

If you know where she is then it would be 'she's on the beach'.

If you just know she went to the beach then saying 'she's on a beach' means you know she's at the beach but you don't know which beach.

Both are grammatically correct but have different meanings.

The first means that she is currently on some beach or other, whilst the second means she is on a specific beach probably about which you have already been speaking.

Both are depending on the context. If it is clear which beach she is on then use 'the'. Also use 'the' if that particular beach has been mentioned in the conversation/text before.

Both or She's at the beach.

She is on the beach

she"s on a beach is you dont know on which beach she is!!

she's on the beach when you are near the beach!!