could nitrify
Verbe régulier : nitrify - nitrified- nitrified

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could nitrify
you could nitrify
she could nitrify
we could nitrify
you could nitrify
they could nitrify 	I could be nitrifying
you could be nitrifying
she could be nitrifying
we could be nitrifying
you could be nitrifying
they could be nitrifying	I could have nitrified
you could have nitrified
she could have nitrified
we could have nitrified
you could have nitrified
they could have nitrified	I could have been nitrifying
you could have been nitrifying
she could have been nitrifying
we could have been nitrifying
you could have been nitrifying
they could have been nitrifying	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't nitrify
you couldn't nitrify
she couldn't nitrify
we couldn't nitrify
you couldn't nitrify
they couldn't nitrify 	I couldn't be nitrifying
you couldn't be nitrifying
she couldn't be nitrifying
we couldn't be nitrifying
you couldn't be nitrifying
they couldn't be nitrifying	I couldn't have nitrified
you couldn't have nitrified
she couldn't have nitrified
we couldn't have nitrified
you couldn't have nitrified
they couldn't have nitrified	I couldn't have been nitrifying
you couldn't have been nitrifying
she couldn't have been nitrifying
we couldn't have been nitrifying
you couldn't have been nitrifying
they couldn't have been nitrifying	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I nitrify?
could you nitrify?
could she nitrify?
could we nitrify?
could you nitrify?
could they nitrify? 	could I be nitrifying?
could you be nitrifying?
could she be nitrifying?
could we be nitrifying?
could you be nitrifying?
could they be nitrifying? 	could I have nitrified?
could you have nitrified?
could she have nitrified?
could we have nitrified?
could you have nitrified?
could they have nitrified? 	could I have been nitrifying?
could you have been nitrifying?
could she have been nitrifying?
could we have been nitrifying?
could you have been nitrifying?
could they have been nitrifying? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I nitrify?
couldn't you nitrify?
couldn't she nitrify?
couldn't we nitrify?
couldn't you nitrify?
couldn't they nitrify? 	couldn't I be nitrifying?
couldn't you be nitrifying?
couldn't she be nitrifying?
couldn't we be nitrifying?
couldn't you be nitrifying?
couldn't they be nitrifying? 	couldn't I have nitrified?
couldn't you have nitrified?
couldn't she have nitrified?
couldn't we have nitrified?
couldn't you have nitrified?
couldn't they have nitrified? 	couldn't I have been nitrifying?
couldn't you have been nitrifying?
couldn't she have been nitrifying?
couldn't we have been nitrifying?
couldn't you have been nitrifying?
couldn't they have been nitrifying?