English verb conjugation
CAN SICKEN

Regular verb: sicken - sickened - sickened

Affirmation

Simple form	V-ing form
I can sicken you can sicken he can sicken we can sicken you can sicken they can sicken	I can be sickening you can be sickening he can be sickening we can be sickening you can be sickening they can be sickening
Perfect	V-ing perfect
I can have sickened you can have sickened he can have sickened we can have sickened you can have sickened they can have sickened	I can have been sickening you can have been sickening he can have been sickening we can have been sickening you can have been sickening they can have been sickening

Negation

Simple form	V-ing form
I can't sicken you can't sicken he can't sicken we can't sicken you can't sicken they can't sicken	I can't be sickening you can't be sickening he can't be sickening we can't be sickening you can't be sickening they can't be sickening
Perfect	V-ing perfect
I can't have sickened you can't have sickened he can't have sickened we can't have sickened you can't have sickened they can't have sickened	I can't have been sickening you can't have been sickening he can't have been sickening we can't have been sickening you can't have been sickening they can't have been sickening

Interrogative form

Simple form	V-ing form
can I sicken? can you sicken? can he sicken? can we sicken? can you sicken? can they sicken?	can I be sickening? can you be sickening? can he be sickening? can we be sickening? can you be sickening? can they be sickening?
Perfect	V-ing perfect
can I have sickened? can you have sickened? can he have sickened? can we have sickened? can you have sickened? can they have sickened?	can I have been sickening? can you have been sickening? can he have been sickening? can we have been sickening? can you have been sickening? can they have been sickening?

Interro-negative form

Simple form	V-ing form
can't I sicken? can't you sicken? can't he sicken? can't we sicken? can't you sicken? can't they sicken?	can't I be sickening? can't you be sickening? can't he be sickening? can't we be sickening? can't you be sickening? can't they be sickening?
Perfect	V-ing perfect
can't I have sickened? can't you have sickened? can't he have sickened? can't we have sickened? can't you have sickened? can't they have sickened?	can't I have been sickening? can't you have been sickening? can't he have been sickening? can't we have been sickening? can't you have been sickening? can't they have been sickening?