English verb conjugation
CAN PUNCH

Regular verb: punch - punched - punched

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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