could concertise
Verbe régulier : concertise - concertised- concertised

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could concertise
you could concertise
he could concertise
we could concertise
you could concertise
they could concertise 	I could be concertising
you could be concertising
he could be concertising
we could be concertising
you could be concertising
they could be concertising	I could have concertised
you could have concertised
he could have concertised
we could have concertised
you could have concertised
they could have concertised	I could have been concertising
you could have been concertising
he could have been concertising
we could have been concertising
you could have been concertising
they could have been concertising	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't concertise
you couldn't concertise
he couldn't concertise
we couldn't concertise
you couldn't concertise
they couldn't concertise 	I couldn't be concertising
you couldn't be concertising
he couldn't be concertising
we couldn't be concertising
you couldn't be concertising
they couldn't be concertising	I couldn't have concertised
you couldn't have concertised
he couldn't have concertised
we couldn't have concertised
you couldn't have concertised
they couldn't have concertised	I couldn't have been concertising
you couldn't have been concertising
he couldn't have been concertising
we couldn't have been concertising
you couldn't have been concertising
they couldn't have been concertising	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I concertise?
could you concertise?
could he concertise?
could we concertise?
could you concertise?
could they concertise? 	could I be concertising?
could you be concertising?
could he be concertising?
could we be concertising?
could you be concertising?
could they be concertising? 	could I have concertised?
could you have concertised?
could he have concertised?
could we have concertised?
could you have concertised?
could they have concertised? 	could I have been concertising?
could you have been concertising?
could he have been concertising?
could we have been concertising?
could you have been concertising?
could they have been concertising? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I concertise?
couldn't you concertise?
couldn't he concertise?
couldn't we concertise?
couldn't you concertise?
couldn't they concertise? 	couldn't I be concertising?
couldn't you be concertising?
couldn't he be concertising?
couldn't we be concertising?
couldn't you be concertising?
couldn't they be concertising? 	couldn't I have concertised?
couldn't you have concertised?
couldn't he have concertised?
couldn't we have concertised?
couldn't you have concertised?
couldn't they have concertised? 	couldn't I have been concertising?
couldn't you have been concertising?
couldn't he have been concertising?
couldn't we have been concertising?
couldn't you have been concertising?
couldn't they have been concertising?