Yes – oui
(Pronounced wee)
To remember that Yes is pronounced wee (oui) in French, use the following mnemonic:
He asked her if she would say yes, but she made the excuse that she needed a wee (oui).

Examples of oui (yes) in a sentence
Oui, je voudrais un café, s'il vous plaît.
(Yes, I would like a coffee, please.)
Oui, bien sûr.
(Yes, of course.)
Oui, je suis d'accord avec toi.
(Yes, I agree with you.)