may underheat
Regular verb: underheat - underheated- underheated

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

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

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

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