could underheat
Verbe régulier : underheat - underheated- underheated

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could underheat
you could underheat
he could underheat
we could underheat
you could underheat
they could underheat 	I could be underheating
you could be underheating
he could be underheating
we could be underheating
you could be underheating
they could be underheating	I could have underheated
you could have underheated
he could have underheated
we could have underheated
you could have underheated
they could have underheated	I could have been underheating
you could have been underheating
he could have been underheating
we could have been underheating
you could have been underheating
they could have been underheating	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't underheat
you couldn't underheat
he couldn't underheat
we couldn't underheat
you couldn't underheat
they couldn't underheat 	I couldn't be underheating
you couldn't be underheating
he couldn't be underheating
we couldn't be underheating
you couldn't be underheating
they couldn't be underheating	I couldn't have underheated
you couldn't have underheated
he couldn't have underheated
we couldn't have underheated
you couldn't have underheated
they couldn't have underheated	I couldn't have been underheating
you couldn't have been underheating
he couldn't have been underheating
we couldn't have been underheating
you couldn't have been underheating
they couldn't have been underheating	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I underheat?
could you underheat?
could he underheat?
could we underheat?
could you underheat?
could they underheat? 	could I be underheating?
could you be underheating?
could he be underheating?
could we be underheating?
could you be underheating?
could they be underheating? 	could I have underheated?
could you have underheated?
could he have underheated?
could we have underheated?
could you have underheated?
could they have underheated? 	could I have been underheating?
could you have been underheating?
could he have been underheating?
could we have been underheating?
could you have been underheating?
could they have been underheating? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I underheat?
couldn't you underheat?
couldn't he underheat?
couldn't we underheat?
couldn't you underheat?
couldn't they underheat? 	couldn't I be underheating?
couldn't you be underheating?
couldn't he be underheating?
couldn't we be underheating?
couldn't you be underheating?
couldn't they be underheating? 	couldn't I have underheated?
couldn't you have underheated?
couldn't he have underheated?
couldn't we have underheated?
couldn't you have underheated?
couldn't they have underheated? 	couldn't I have been underheating?
couldn't you have been underheating?
couldn't he have been underheating?
couldn't we have been underheating?
couldn't you have been underheating?
couldn't they have been underheating?