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 cannot punch you cannot punch he cannot punch we cannot punch you cannot punch they cannot punch	I cannot be punching you cannot be punching he cannot be punching we cannot be punching you cannot be punching they cannot be punching
Perfect	V-ing perfect
I cannot have punched you cannot have punched he cannot have punched we cannot have punched you cannot have punched they cannot have punched	I cannot have been punching you cannot have been punching he cannot have been punching we cannot have been punching you cannot have been punching they cannot 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 I not punch? can you not punch? can he not punch? can we not punch? can you not punch? can they not punch?	can I not be punching? can you not be punching? can he not be punching? can we not be punching? can you not be punching? can they not be punching?
Perfect	V-ing perfect
can I not have punched? can you not have punched? can he not have punched? can we not have punched? can you not have punched? can they not have punched?	can I not have been punching? can you not have been punching? can he not have been punching? can we not have been punching? can you not have been punching? can they not have been punching?