It's not necessary/obligatory that you go.

You shouldn't go.

You must go.

You must not go.

I'm very satisfied with your work. Well done!

She finally completed the project.

Before, I was thirsty; now my thirst has been quenched.

You should have gone.

You should go.

Father is content that it's been decided Loak will be a hunter.

Tsenu:
Did you get enough to eat?
Kamun:
(a) Almost. (What's for dessert?)
(b) Yes. That'll be enough.
(c) Very! I'm quite full.
(d) Oooh. I ate too much.

Tsenu: I believe it was a mistake for him to have gone.
Kamun: No, no! He should have gone!