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
she could submarine
we could submarine
you could submarine
they could submarine 	I could be submarining
you could be submarining
she could be submarining
we could be submarining
you could be submarining
they could be submarining	I could have submarined
you could have submarined
she 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
she 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
she 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
she 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
she 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
she 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 she submarine?
could we submarine?
could you submarine?
could they submarine? 	could I be submarining?
could you be submarining?
could she be submarining?
could we be submarining?
could you be submarining?
could they be submarining? 	could I have submarined?
could you have submarined?
could she 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 she 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 she 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 she 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 she 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 she have been submarining?
couldn't we have been submarining?
couldn't you have been submarining?
couldn't they have been submarining?