1. I am a boy.
   Are you a boy?
2. He is dancing.
    Is he dancing?
3. That pen is very expensive.
    Is that pen expensive?
4. He is on a trip right now.
    Is he on a trip right now?
5. The day is very nice.
    Is the day very nice?
6. That teacher is insane in giving tests.
     Is that teacher insane in giving tests?
7. The boy went inside the room.
     Did the boy went inside the room?
8. The playful students accidentally broke the glass window.
     Did the playful students broke the glass window?
9. The weather looks cloudy.
     Is the weather cloudy?
10. The boy who ran after the cat is missing.
      Was the boy who ran after the cat gone missing?