English verb conjugation
MUST UNDERACHIEVE

Regular verb: underachieve - underachieved - underachieved

Affirmation

Simple form	V-ing form
I must underachieve you must underachieve he must underachieve we must underachieve you must underachieve they must underachieve	I must be underachieving you must be underachieving he must be underachieving we must be underachieving you must be underachieving they must be underachieving
Perfect	V-ing perfect
I must have underachieved you must have underachieved he must have underachieved we must have underachieved you must have underachieved they must have underachieved	I must have been underachieving you must have been underachieving he must have been underachieving we must have been underachieving you must have been underachieving they must have been underachieving

Negation

Simple form	V-ing form
I must not underachieve you must not underachieve he must not underachieve we must not underachieve you must not underachieve they must not underachieve	I must not be underachieving you must not be underachieving he must not be underachieving we must not be underachieving you must not be underachieving they must not be underachieving
Perfect	V-ing perfect
I must not have underachieved you must not have underachieved he must not have underachieved we must not have underachieved you must not have underachieved they must not have underachieved	I must not have been underachieving you must not have been underachieving he must not have been underachieving we must not have been underachieving you must not have been underachieving they must not have been underachieving

Interrogative form

Simple form	V-ing form
must I underachieve? must you underachieve? must he underachieve? must we underachieve? must you underachieve? must they underachieve?	must I be underachieving? must you be underachieving? must he be underachieving? must we be underachieving? must you be underachieving? must they be underachieving?
Perfect	V-ing perfect
must I have underachieved? must you have underachieved? must he have underachieved? must we have underachieved? must you have underachieved? must they have underachieved?	must I have been underachieving? must you have been underachieving? must he have been underachieving? must we have been underachieving? must you have been underachieving? must they have been underachieving?

Interro-negative form

Simple form	V-ing form
must I not underachieve? must you not underachieve? must he not underachieve? must we not underachieve? must you not underachieve? must they not underachieve?	must I not be underachieving? must you not be underachieving? must he not be underachieving? must we not be underachieving? must you not be underachieving? must they not be underachieving?
Perfect	V-ing perfect
must I not have underachieved? must you not have underachieved? must he not have underachieved? must we not have underachieved? must you not have underachieved? must they not have underachieved?	must I not have been underachieving? must you not have been underachieving? must he not have been underachieving? must we not have been underachieving? must you not have been underachieving? must they not have been underachieving?