could submarine
Verbe régulier : submarine - submarined- submarined

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could submarine
you could submarine
he could submarine
we could submarine
you could submarine
they could submarine 	I could be submarining
you could be submarining
he could be submarining
we could be submarining
you could be submarining
they could be submarining	I could have submarined
you could have submarined
he could have submarined
we could have submarined
you could have submarined
they could have submarined	I could have been submarining
you could have been submarining
he could have been submarining
we could have been submarining
you could have been submarining
they could have been submarining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't submarine
you couldn't submarine
he couldn't submarine
we couldn't submarine
you couldn't submarine
they couldn't submarine 	I couldn't be submarining
you couldn't be submarining
he couldn't be submarining
we couldn't be submarining
you couldn't be submarining
they couldn't be submarining	I couldn't have submarined
you couldn't have submarined
he couldn't have submarined
we couldn't have submarined
you couldn't have submarined
they couldn't have submarined	I couldn't have been submarining
you couldn't have been submarining
he couldn't have been submarining
we couldn't have been submarining
you couldn't have been submarining
they couldn't have been submarining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I submarine?
could you submarine?
could he submarine?
could we submarine?
could you submarine?
could they submarine? 	could I be submarining?
could you be submarining?
could he be submarining?
could we be submarining?
could you be submarining?
could they be submarining? 	could I have submarined?
could you have submarined?
could he have submarined?
could we have submarined?
could you have submarined?
could they have submarined? 	could I have been submarining?
could you have been submarining?
could he have been submarining?
could we have been submarining?
could you have been submarining?
could they have been submarining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I submarine?
couldn't you submarine?
couldn't he submarine?
couldn't we submarine?
couldn't you submarine?
couldn't they submarine? 	couldn't I be submarining?
couldn't you be submarining?
couldn't he be submarining?
couldn't we be submarining?
couldn't you be submarining?
couldn't they be submarining? 	couldn't I have submarined?
couldn't you have submarined?
couldn't he have submarined?
couldn't we have submarined?
couldn't you have submarined?
couldn't they have submarined? 	couldn't I have been submarining?
couldn't you have been submarining?
couldn't he have been submarining?
couldn't we have been submarining?
couldn't you have been submarining?
couldn't they have been submarining?