1. Were they late / they were
2. Must they come / they must
3. Do they come / they do
4. Did they come / they did
5. Can she come / she can
6. Will his friend’s sister play / she will
7. Must Kate’s pet eat / it must
8. Can Ted and Nick’s sister make / she can
9. Was the boys’ grandmother / she was
10. Do his friend’s parents work / they do