English verb conjugation
CAN SICKEN

Regular verb: sicken - sickened - sickened

Affirmation

Simple form	V-ing form
I can sicken you can sicken she can sicken we can sicken you can sicken they can sicken	I can be sickening you can be sickening she 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 she 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 she 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 she cannot sicken we cannot sicken you cannot sicken they cannot sicken	I cannot be sickening you cannot be sickening she 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 she 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 she 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 she sicken? can we sicken? can you sicken? can they sicken?	can I be sickening? can you be sickening? can she 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 she 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 she 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 she 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 she 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 she 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 she not have been sickening? can we not have been sickening? can you not have been sickening? can they not have been sickening?