English verb conjugation
MUST UNDERHEAT

Regular verb: underheat - underheated - underheated

Affirmation

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

Negation

Simple form	V-ing form
I must not underheat you must not underheat he must not underheat we must not underheat you must not underheat they must not underheat	I must not be underheating you must not be underheating he must not be underheating we must not be underheating you must not be underheating they must not be underheating
Perfect	V-ing perfect
I must not have underheated you must not have underheated he must not have underheated we must not have underheated you must not have underheated they must not have underheated	I must not have been underheating you must not have been underheating he must not have been underheating we must not have been underheating you must not have been underheating they must not have been underheating

Interrogative form

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

Interro-negative form

Simple form	V-ing form
must I not underheat? must you not underheat? must he not underheat? must we not underheat? must you not underheat? must they not underheat?	must I not be underheating? must you not be underheating? must he not be underheating? must we not be underheating? must you not be underheating? must they not be underheating?
Perfect	V-ing perfect
must I not have underheated? must you not have underheated? must he not have underheated? must we not have underheated? must you not have underheated? must they not have underheated?	must I not have been underheating? must you not have been underheating? must he not have been underheating? must we not have been underheating? must you not have been underheating? must they not have been underheating?