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

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