"There are clothes in the basket."
Translation:Tá éadaí sa chiseán.
I don't understand why this is 'sa', but a similiar question was 'san'.
It's all based on the starting letter of the following word. Irish really doesn't like two vowels coming together, so with sa, it changes to san before a vowel sound (a vowel of fh + vowel). Before a consonant, you'll see sa.