My granddad / run very fast. ( + )
My granddad can run very fast.
Jane / climb mountains (+)
Jane can climb mountains.
He / do karate ( - )
He can't do karate.
The cat / climb a tree ( - )
The cat can climb a tree.
She / make cakes ( - )
She can't make cakes.
We / do gymnastics ( - )
We can't do gymnastics.
I / make models ( + )
I can make models.