1/
· Because it may scratch you.
· Because you may fall off the bike
· Because you may fall off the tree
2/
Why shouldn't I touches the stove?
→ touch
He may fall and broke his leg
→ break
Phong is ride his bike too fast. He may fall off his bike.
→ is riding
What is she do?
→ doing
Should you doing that?
→ do
3/
· a
· a
· a
· b
· b
· b