English verb conjugation
CAN UNDERACHIEVE

Regular verb: underachieve - underachieved - underachieved

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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