could snowboard
Regular verb: snowboard - snowboarded- snowboarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could snowboard
you could snowboard
she could snowboard
we could snowboard
you could snowboard
they could snowboard 	I could be snowboarding
you could be snowboarding
she could be snowboarding
we could be snowboarding
you could be snowboarding
they could be snowboarding	I could have snowboarded
you could have snowboarded
she could have snowboarded
we could have snowboarded
you could have snowboarded
they could have snowboarded	I could have been snowboarding
you could have been snowboarding
she could have been snowboarding
we could have been snowboarding
you could have been snowboarding
they could have been snowboarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't snowboard
you couldn't snowboard
she couldn't snowboard
we couldn't snowboard
you couldn't snowboard
they couldn't snowboard 	I couldn't be snowboarding
you couldn't be snowboarding
she couldn't be snowboarding
we couldn't be snowboarding
you couldn't be snowboarding
they couldn't be snowboarding	I couldn't have snowboarded
you couldn't have snowboarded
she couldn't have snowboarded
we couldn't have snowboarded
you couldn't have snowboarded
they couldn't have snowboarded	I couldn't have been snowboarding
you couldn't have been snowboarding
she couldn't have been snowboarding
we couldn't have been snowboarding
you couldn't have been snowboarding
they couldn't have been snowboarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I snowboard?
could you snowboard?
could she snowboard?
could we snowboard?
could you snowboard?
could they snowboard? 	could I be snowboarding?
could you be snowboarding?
could she be snowboarding?
could we be snowboarding?
could you be snowboarding?
could they be snowboarding? 	could I have snowboarded?
could you have snowboarded?
could she have snowboarded?
could we have snowboarded?
could you have snowboarded?
could they have snowboarded? 	could I have been snowboarding?
could you have been snowboarding?
could she have been snowboarding?
could we have been snowboarding?
could you have been snowboarding?
could they have been snowboarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I snowboard?
couldn't you snowboard?
couldn't she snowboard?
couldn't we snowboard?
couldn't you snowboard?
couldn't they snowboard? 	couldn't I be snowboarding?
couldn't you be snowboarding?
couldn't she be snowboarding?
couldn't we be snowboarding?
couldn't you be snowboarding?
couldn't they be snowboarding? 	couldn't I have snowboarded?
couldn't you have snowboarded?
couldn't she have snowboarded?
couldn't we have snowboarded?
couldn't you have snowboarded?
couldn't they have snowboarded? 	couldn't I have been snowboarding?
couldn't you have been snowboarding?
couldn't she have been snowboarding?
couldn't we have been snowboarding?
couldn't you have been snowboarding?
couldn't they have been snowboarding?