1. Please, don't be angry at him.
2. Yesterday i got a satisfactory mark at the biology lesson.
3. Are you angry at him?
Why are you angry at him?
You are angry at him, aren't you?
Are you angry or happy about him?
Who is angry at him?
4. happy-happier-happiest
sad-sadder-saddest
coy-coyer-coyest