English verb conjugation
CAN UNDERACHIEVE

Regular verb: underachieve - underachieved - underachieved

Affirmation

Simple form	V-ing form
I can underachieve you can underachieve she can underachieve we can underachieve you can underachieve they can underachieve	I can be underachieving you can be underachieving she 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 she 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 she 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 can't underachieve you can't underachieve she can't underachieve we can't underachieve you can't underachieve they can't underachieve	I can't be underachieving you can't be underachieving she can't be underachieving we can't be underachieving you can't be underachieving they can't be underachieving
Perfect	V-ing perfect
I can't have underachieved you can't have underachieved she can't have underachieved we can't have underachieved you can't have underachieved they can't have underachieved	I can't have been underachieving you can't have been underachieving she can't have been underachieving we can't have been underachieving you can't have been underachieving they can't have been underachieving

Interrogative form

Simple form	V-ing form
can I underachieve? can you underachieve? can she underachieve? can we underachieve? can you underachieve? can they underachieve?	can I be underachieving? can you be underachieving? can she 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 she 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 she 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't I underachieve? can't you underachieve? can't she underachieve? can't we underachieve? can't you underachieve? can't they underachieve?	can't I be underachieving? can't you be underachieving? can't she be underachieving? can't we be underachieving? can't you be underachieving? can't they be underachieving?
Perfect	V-ing perfect
can't I have underachieved? can't you have underachieved? can't she have underachieved? can't we have underachieved? can't you have underachieved? can't they have underachieved?	can't I have been underachieving? can't you have been underachieving? can't she have been underachieving? can't we have been underachieving? can't you have been underachieving? can't they have been underachieving?