could underheat
Regular verb: underheat - underheated- underheated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underheat
you could underheat
she could underheat
we could underheat
you could underheat
they could underheat 	I could be underheating
you could be underheating
she could be underheating
we could be underheating
you could be underheating
they could be underheating	I could have underheated
you could have underheated
she 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
she could have been underheating
we could have been underheating
you could have been underheating
they could have been underheating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't underheat
you couldn't underheat
she 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
she 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
she 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
she couldn't have been underheating
we couldn't have been underheating
you couldn't have been underheating
they couldn't have been underheating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I underheat?
could you underheat?
could she underheat?
could we underheat?
could you underheat?
could they underheat? 	could I be underheating?
could you be underheating?
could she be underheating?
could we be underheating?
could you be underheating?
could they be underheating? 	could I have underheated?
could you have underheated?
could she 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 she have been underheating?
could we have been underheating?
could you have been underheating?
could they have been underheating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I underheat?
couldn't you underheat?
couldn't she 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 she 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 she 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 she have been underheating?
couldn't we have been underheating?
couldn't you have been underheating?
couldn't they have been underheating?