can sicken
Regular verb: sicken - sickened- sickened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?