English verb conjugation
CAN UNDERMINE

Regular verb: undermine - undermined - undermined

Affirmation

Simple form	V-ing form
I can undermine you can undermine he can undermine we can undermine you can undermine they can undermine	I can be undermining you can be undermining he can be undermining we can be undermining you can be undermining they can be undermining
Perfect	V-ing perfect
I can have undermined you can have undermined he can have undermined we can have undermined you can have undermined they can have undermined	I can have been undermining you can have been undermining he can have been undermining we can have been undermining you can have been undermining they can have been undermining

Negation

Simple form	V-ing form
I can't undermine you can't undermine he can't undermine we can't undermine you can't undermine they can't undermine	I can't be undermining you can't be undermining he can't be undermining we can't be undermining you can't be undermining they can't be undermining
Perfect	V-ing perfect
I can't have undermined you can't have undermined he can't have undermined we can't have undermined you can't have undermined they can't have undermined	I can't have been undermining you can't have been undermining he can't have been undermining we can't have been undermining you can't have been undermining they can't have been undermining

Interrogative form

Simple form	V-ing form
can I undermine? can you undermine? can he undermine? can we undermine? can you undermine? can they undermine?	can I be undermining? can you be undermining? can he be undermining? can we be undermining? can you be undermining? can they be undermining?
Perfect	V-ing perfect
can I have undermined? can you have undermined? can he have undermined? can we have undermined? can you have undermined? can they have undermined?	can I have been undermining? can you have been undermining? can he have been undermining? can we have been undermining? can you have been undermining? can they have been undermining?

Interro-negative form

Simple form	V-ing form
can't I undermine? can't you undermine? can't he undermine? can't we undermine? can't you undermine? can't they undermine?	can't I be undermining? can't you be undermining? can't he be undermining? can't we be undermining? can't you be undermining? can't they be undermining?
Perfect	V-ing perfect
can't I have undermined? can't you have undermined? can't he have undermined? can't we have undermined? can't you have undermined? can't they have undermined?	can't I have been undermining? can't you have been undermining? can't he have been undermining? can't we have been undermining? can't you have been undermining? can't they have been undermining?