English verb conjugation
CAN UNDERHEAT

Regular verb: underheat - underheated - underheated

Affirmation

Simple form	V-ing form
I can underheat you can underheat he can underheat we can underheat you can underheat they can underheat	I can be underheating you can be underheating he can be underheating we can be underheating you can be underheating they can be underheating
Perfect	V-ing perfect
I can have underheated you can have underheated he can have underheated we can have underheated you can have underheated they can have underheated	I can have been underheating you can have been underheating he can have been underheating we can have been underheating you can have been underheating they can have been underheating

Negation

Simple form	V-ing form
I can't underheat you can't underheat he can't underheat we can't underheat you can't underheat they can't underheat	I can't be underheating you can't be underheating he can't be underheating we can't be underheating you can't be underheating they can't be underheating
Perfect	V-ing perfect
I can't have underheated you can't have underheated he can't have underheated we can't have underheated you can't have underheated they can't have underheated	I can't have been underheating you can't have been underheating he can't have been underheating we can't have been underheating you can't have been underheating they can't have been underheating

Interrogative form

Simple form	V-ing form
can I underheat? can you underheat? can he underheat? can we underheat? can you underheat? can they underheat?	can I be underheating? can you be underheating? can he be underheating? can we be underheating? can you be underheating? can they be underheating?
Perfect	V-ing perfect
can I have underheated? can you have underheated? can he have underheated? can we have underheated? can you have underheated? can they have underheated?	can I have been underheating? can you have been underheating? can he have been underheating? can we have been underheating? can you have been underheating? can they have been underheating?

Interro-negative form

Simple form	V-ing form
can't I underheat? can't you underheat? can't he underheat? can't we underheat? can't you underheat? can't they underheat?	can't I be underheating? can't you be underheating? can't he be underheating? can't we be underheating? can't you be underheating? can't they be underheating?
Perfect	V-ing perfect
can't I have underheated? can't you have underheated? can't he have underheated? can't we have underheated? can't you have underheated? can't they have underheated?	can't I have been underheating? can't you have been underheating? can't he have been underheating? can't we have been underheating? can't you have been underheating? can't they have been underheating?