We just learned how to say I am happy in French.
Now let's learn how to say You are sad.
We can break it up into the three words:
You - Vous - sounds like vooz /?/
Remember that we learned Vous is pronounced like voo, in très bien merci et vous?
But when there is a vowel sound after vous then you say a Z sound at the end.
are - êtes - sounds like et /?/
sad - triste - Sounds like tuh-east-uh /?/
Since the êtes ends with a t sound, and the triste starts with a t sound,
they mix together.
So all together Vous êtes triste sounds like vooz-eh-tuh-east-uh.