could understeer
Verbe régulier : understeer - understeered- understeered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could understeer
you could understeer
she could understeer
we could understeer
you could understeer
they could understeer 	I could be understeering
you could be understeering
she could be understeering
we could be understeering
you could be understeering
they could be understeering	I could have understeered
you could have understeered
she could have understeered
we could have understeered
you could have understeered
they could have understeered	I could have been understeering
you could have been understeering
she could have been understeering
we could have been understeering
you could have been understeering
they could have been understeering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't understeer
you couldn't understeer
she couldn't understeer
we couldn't understeer
you couldn't understeer
they couldn't understeer 	I couldn't be understeering
you couldn't be understeering
she couldn't be understeering
we couldn't be understeering
you couldn't be understeering
they couldn't be understeering	I couldn't have understeered
you couldn't have understeered
she couldn't have understeered
we couldn't have understeered
you couldn't have understeered
they couldn't have understeered	I couldn't have been understeering
you couldn't have been understeering
she couldn't have been understeering
we couldn't have been understeering
you couldn't have been understeering
they couldn't have been understeering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I understeer?
could you understeer?
could she understeer?
could we understeer?
could you understeer?
could they understeer? 	could I be understeering?
could you be understeering?
could she be understeering?
could we be understeering?
could you be understeering?
could they be understeering? 	could I have understeered?
could you have understeered?
could she have understeered?
could we have understeered?
could you have understeered?
could they have understeered? 	could I have been understeering?
could you have been understeering?
could she have been understeering?
could we have been understeering?
could you have been understeering?
could they have been understeering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I understeer?
couldn't you understeer?
couldn't she understeer?
couldn't we understeer?
couldn't you understeer?
couldn't they understeer? 	couldn't I be understeering?
couldn't you be understeering?
couldn't she be understeering?
couldn't we be understeering?
couldn't you be understeering?
couldn't they be understeering? 	couldn't I have understeered?
couldn't you have understeered?
couldn't she have understeered?
couldn't we have understeered?
couldn't you have understeered?
couldn't they have understeered? 	couldn't I have been understeering?
couldn't you have been understeering?
couldn't she have been understeering?
couldn't we have been understeering?
couldn't you have been understeering?
couldn't they have been understeering?