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 cannot sicken you cannot sicken he cannot sicken we cannot sicken you cannot sicken they cannot sicken	I cannot be sickening you cannot be sickening he cannot be sickening we cannot be sickening you cannot be sickening they cannot be sickening
Perfect	V-ing perfect
I cannot have sickened you cannot have sickened he cannot have sickened we cannot have sickened you cannot have sickened they cannot have sickened	I cannot have been sickening you cannot have been sickening he cannot have been sickening we cannot have been sickening you cannot have been sickening they cannot 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 I not sicken? can you not sicken? can he not sicken? can we not sicken? can you not sicken? can they not sicken?	can I not be sickening? can you not be sickening? can he not be sickening? can we not be sickening? can you not be sickening? can they not be sickening?
Perfect	V-ing perfect
can I not have sickened? can you not have sickened? can he not have sickened? can we not have sickened? can you not have sickened? can they not have sickened?	can I not have been sickening? can you not have been sickening? can he not have been sickening? can we not have been sickening? can you not have been sickening? can they not have been sickening?