could surfboard
Verbe régulier : surfboard - surfboarded- surfboarded

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could surfboard
you could surfboard
he could surfboard
we could surfboard
you could surfboard
they could surfboard 	I could be surfboarding
you could be surfboarding
he could be surfboarding
we could be surfboarding
you could be surfboarding
they could be surfboarding	I could have surfboarded
you could have surfboarded
he could have surfboarded
we could have surfboarded
you could have surfboarded
they could have surfboarded	I could have been surfboarding
you could have been surfboarding
he could have been surfboarding
we could have been surfboarding
you could have been surfboarding
they could have been surfboarding	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't surfboard
you couldn't surfboard
he couldn't surfboard
we couldn't surfboard
you couldn't surfboard
they couldn't surfboard 	I couldn't be surfboarding
you couldn't be surfboarding
he couldn't be surfboarding
we couldn't be surfboarding
you couldn't be surfboarding
they couldn't be surfboarding	I couldn't have surfboarded
you couldn't have surfboarded
he couldn't have surfboarded
we couldn't have surfboarded
you couldn't have surfboarded
they couldn't have surfboarded	I couldn't have been surfboarding
you couldn't have been surfboarding
he couldn't have been surfboarding
we couldn't have been surfboarding
you couldn't have been surfboarding
they couldn't have been surfboarding	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I surfboard?
could you surfboard?
could he surfboard?
could we surfboard?
could you surfboard?
could they surfboard? 	could I be surfboarding?
could you be surfboarding?
could he be surfboarding?
could we be surfboarding?
could you be surfboarding?
could they be surfboarding? 	could I have surfboarded?
could you have surfboarded?
could he have surfboarded?
could we have surfboarded?
could you have surfboarded?
could they have surfboarded? 	could I have been surfboarding?
could you have been surfboarding?
could he have been surfboarding?
could we have been surfboarding?
could you have been surfboarding?
could they have been surfboarding? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I surfboard?
couldn't you surfboard?
couldn't he surfboard?
couldn't we surfboard?
couldn't you surfboard?
couldn't they surfboard? 	couldn't I be surfboarding?
couldn't you be surfboarding?
couldn't he be surfboarding?
couldn't we be surfboarding?
couldn't you be surfboarding?
couldn't they be surfboarding? 	couldn't I have surfboarded?
couldn't you have surfboarded?
couldn't he have surfboarded?
couldn't we have surfboarded?
couldn't you have surfboarded?
couldn't they have surfboarded? 	couldn't I have been surfboarding?
couldn't you have been surfboarding?
couldn't he have been surfboarding?
couldn't we have been surfboarding?
couldn't you have been surfboarding?
couldn't they have been surfboarding?