could understand
Verbe irrégulier : understand - understood- understood
Traduction française : comprendre 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could understand
you could understand
he could understand
we could understand
you could understand
they could understand 	I could be understanding
you could be understanding
he could be understanding
we could be understanding
you could be understanding
they could be understanding	I could have understood
you could have understood
he could have understood
we could have understood
you could have understood
they could have understood	I could have been understanding
you could have been understanding
he could have been understanding
we could have been understanding
you could have been understanding
they could have been understanding	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't understand
you couldn't understand
he couldn't understand
we couldn't understand
you couldn't understand
they couldn't understand 	I couldn't be understanding
you couldn't be understanding
he couldn't be understanding
we couldn't be understanding
you couldn't be understanding
they couldn't be understanding	I couldn't have understood
you couldn't have understood
he couldn't have understood
we couldn't have understood
you couldn't have understood
they couldn't have understood	I couldn't have been understanding
you couldn't have been understanding
he couldn't have been understanding
we couldn't have been understanding
you couldn't have been understanding
they couldn't have been understanding	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I understand?
could you understand?
could he understand?
could we understand?
could you understand?
could they understand? 	could I be understanding?
could you be understanding?
could he be understanding?
could we be understanding?
could you be understanding?
could they be understanding? 	could I have understood?
could you have understood?
could he have understood?
could we have understood?
could you have understood?
could they have understood? 	could I have been understanding?
could you have been understanding?
could he have been understanding?
could we have been understanding?
could you have been understanding?
could they have been understanding? 	

Forme interro-négative 	
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couldn't I understand?
couldn't you understand?
couldn't he understand?
couldn't we understand?
couldn't you understand?
couldn't they understand? 	couldn't I be understanding?
couldn't you be understanding?
couldn't he be understanding?
couldn't we be understanding?
couldn't you be understanding?
couldn't they be understanding? 	couldn't I have understood?
couldn't you have understood?
couldn't he have understood?
couldn't we have understood?
couldn't you have understood?
couldn't they have understood? 	couldn't I have been understanding?
couldn't you have been understanding?
couldn't he have been understanding?
couldn't we have been understanding?
couldn't you have been understanding?
couldn't they have been understanding?