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 can't underachieve you can't underachieve he 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 he 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 he 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 he 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 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't I underachieve? can't you underachieve? can't he 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 he 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 he 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 he have been underachieving? can't we have been underachieving? can't you have been underachieving? can't they have been underachieving?