Answer:
singular
The boy had a baseball in his hand.
My horse prefers to wear an English saddle.
That cat never seems to tire of jumping in and out of the box.
You stole my idea and didn’t give me any credit.
Your mom is going to be upset about that broken lamp.
It’s not difficult to grow a tree as long as you give it plenty of water.
I can’t believe you let your dog stick his head out the window while you drive
plural
The boys were throwing baseballs back and forth between bases.
Our horses are much happier wearing lightweight English saddles.
Those cats never seem to tire of chasing one another in and out of those boxes.
You stole my ideas and didn’t give me any credit.
Our moms are going to be upset that we stayed out all night going to parties.
It’s not too difficult to grow trees as long as you provide them with plenty of water.
I can’t believe you allow your dogs to climb all over the seats while you are driving.