Write sentences. Use the present perfect affirmative or negative with already or yet. Then write question with yet and short answer.
William/ finish his homework
X 4. David/ answer my email
✓5. Simon and you / have dinner
ex
James / go to bed
→James has already gone to bed.
Has James gone to bed yet? Yes, he has.
X 2. they/ not decide what to do
→They haven't decided what to do yet.
Have they decided what to do yet? No, they haven't.