How do they say the in Welsh?

There is no direct translation for "the" in Welsh, as it's not a separate word like in English. Instead, the concept of "the" is indicated through definite articles that change depending on the noun's gender, number, and mutation.

Here are some examples:

* Y - Used for singular masculine nouns: Y dyn (the man)

* Yr - Used for singular feminine and plural nouns, as well as some singular masculine nouns: Yr enw (the name), Yr awyr (the air), Yr awelon (the breeze)

* Y - Also used for plural nouns when the first letter of the noun doesn't change after mutation: Y plant (the children)

It's important to note that the definite articles can change based on the initial letter of the noun and the context.

So, "the" in Welsh is not a standalone word, but rather an element that changes depending on the noun it modifies.