English verb conjugation
CAN WATER-SKI

Regular verb: water-ski - water-skied - water-skied

Affirmation

Simple form	V-ing form
I can water-ski you can water-ski he can water-ski we can water-ski you can water-ski they can water-ski	I can be water-skiing you can be water-skiing he can be water-skiing we can be water-skiing you can be water-skiing they can be water-skiing
Perfect	V-ing perfect
I can have water-skied you can have water-skied he can have water-skied we can have water-skied you can have water-skied they can have water-skied	I can have been water-skiing you can have been water-skiing he can have been water-skiing we can have been water-skiing you can have been water-skiing they can have been water-skiing

Negation

Simple form	V-ing form
I can't water-ski you can't water-ski he can't water-ski we can't water-ski you can't water-ski they can't water-ski	I can't be water-skiing you can't be water-skiing he can't be water-skiing we can't be water-skiing you can't be water-skiing they can't be water-skiing
Perfect	V-ing perfect
I can't have water-skied you can't have water-skied he can't have water-skied we can't have water-skied you can't have water-skied they can't have water-skied	I can't have been water-skiing you can't have been water-skiing he can't have been water-skiing we can't have been water-skiing you can't have been water-skiing they can't have been water-skiing

Interrogative form

Simple form	V-ing form
can I water-ski? can you water-ski? can he water-ski? can we water-ski? can you water-ski? can they water-ski?	can I be water-skiing? can you be water-skiing? can he be water-skiing? can we be water-skiing? can you be water-skiing? can they be water-skiing?
Perfect	V-ing perfect
can I have water-skied? can you have water-skied? can he have water-skied? can we have water-skied? can you have water-skied? can they have water-skied?	can I have been water-skiing? can you have been water-skiing? can he have been water-skiing? can we have been water-skiing? can you have been water-skiing? can they have been water-skiing?

Interro-negative form

Simple form	V-ing form
can't I water-ski? can't you water-ski? can't he water-ski? can't we water-ski? can't you water-ski? can't they water-ski?	can't I be water-skiing? can't you be water-skiing? can't he be water-skiing? can't we be water-skiing? can't you be water-skiing? can't they be water-skiing?
Perfect	V-ing perfect
can't I have water-skied? can't you have water-skied? can't he have water-skied? can't we have water-skied? can't you have water-skied? can't they have water-skied?	can't I have been water-skiing? can't you have been water-skiing? can't he have been water-skiing? can't we have been water-skiing? can't you have been water-skiing? can't they have been water-skiing?