№10. Open the brackets: 1. One fly … (to fly), two flies … (to fly). 2. One girl … (to cry), four girls … (to cry). 3. When a wolf … (to see) the moon, it … (to begin) to howl. 4. Wolves and sheep … (to be) never friends. 5. Our hens … (to lay) a lot of eggs. 6. Boys … (to fight) and … (to shoot). 7. That boy … (to try) to catch some balls.

1. One fly flies, two flies fly.
2. One girl cries, four girls cry.
3. When a wolf sees the moon, it begins to howl.
4. Wolves and sheep are never friends.
5. Our hens lay a lot of eggs.
6. Boys fight and shoot.
7. That boy tries to catch some balls.

Правило: в Present Simple окончание -s/-es употребляется с he, she, it и существительным в единственном числе. После множественного числа используется начальная форма глагола.