The/a swing

I know you like the playground. Do you like to ride on the swing or the slide?

Thank you.

Even If you don't make an extra comment like 'I know....the playground', is it still 'the'? And what I infer from 'the' above is something you usually use in "a" playground, not a particular one, but one that you know what I am talking about, is this a correct interpertation, which has been rejected by many, but that is only I could understand from the passge.

A speaker uses "a" or "the" depending on his knowledge of what the listener knows, or what he assumes from the context.

Context: You are eating lunch at home.
Do you like to ride on a swing? Maybe after lunch we can go to the park.

Context: You are standing in a park looking at the playground, watching the children play on the equipment..
Do you like to ride on the swing?

Anonymous1. Do you like to ride on the swing/slide?

The word "ride" is an odd, unnatural choice. People normally talk about going or playing on things in a playground.

AlpheccaStarsA speaker uses "a" or "the" depending on his knowledge of what the listener knows, or what he assumes from the context.Context: You are eating lunch at home.Do you like to ride on a swing? Maybe after lunch we can go to the park.Context: You are standing in a park looking at the playground, watching the children play on the equipment..Do you like to ride on t

onizoSo my context here is I meet a girl in a coffee house and ask her just to make a conversation that if she likes to ride on swings.

You just met the person in a coffee house. You have not been discussing playgrounds. There is no context for a particular, identified swing.

When you were a girl, did you like to play with a ball or swing

Thanks.

In the same context, I am not talking to an adult, but a three year girl, and whose exprience is very in present. Is it still 'a'?

Yes.

AlpheccaStarsI know you like the playground. Do you like to ride on the swing or the slide?

Thank you.

Then what is the meaning of the in the above your example? Are you talking in the playground looking at the equipment; is that why you used the here?

onizo why you used the here?

Remember the context. You know the other person knows about a particular playground.
You don't have to be there physically.