English verb conjugation
COULD PUNCH

Regular verb: punch - punched - punched

Affirmation

Simple form	V-ing form
I could punch you could punch he could punch we could punch you could punch they could punch	I could be punching you could be punching he could be punching we could be punching you could be punching they could be punching
Perfect	V-ing perfect
I could have punched you could have punched he could have punched we could have punched you could have punched they could have punched	I could have been punching you could have been punching he could have been punching we could have been punching you could have been punching they could have been punching

Negation

Simple form	V-ing form
I couldn't punch you couldn't punch he couldn't punch we couldn't punch you couldn't punch they couldn't punch	I couldn't be punching you couldn't be punching he couldn't be punching we couldn't be punching you couldn't be punching they couldn't be punching
Perfect	V-ing perfect
I couldn't have punched you couldn't have punched he couldn't have punched we couldn't have punched you couldn't have punched they couldn't have punched	I couldn't have been punching you couldn't have been punching he couldn't have been punching we couldn't have been punching you couldn't have been punching they couldn't have been punching

Interrogative form

Simple form	V-ing form
could I punch? could you punch? could he punch? could we punch? could you punch? could they punch?	could I be punching? could you be punching? could he be punching? could we be punching? could you be punching? could they be punching?
Perfect	V-ing perfect
could I have punched? could you have punched? could he have punched? could we have punched? could you have punched? could they have punched?	could I have been punching? could you have been punching? could he have been punching? could we have been punching? could you have been punching? could they have been punching?

Interro-negative form

Simple form	V-ing form
couldn't I punch? couldn't you punch? couldn't he punch? couldn't we punch? couldn't you punch? couldn't they punch?	couldn't I be punching? couldn't you be punching? couldn't he be punching? couldn't we be punching? couldn't you be punching? couldn't they be punching?
Perfect	V-ing perfect
couldn't I have punched? couldn't you have punched? couldn't he have punched? couldn't we have punched? couldn't you have punched? couldn't they have punched?	couldn't I have been punching? couldn't you have been punching? couldn't he have been punching? couldn't we have been punching? couldn't you have been punching? couldn't they have been punching?