English verb conjugation
CAN ROIL

Regular verb: roil - roiled - roiled

Affirmation

Simple form	V-ing form
I can roil you can roil she can roil we can roil you can roil they can roil	I can be roiling you can be roiling she can be roiling we can be roiling you can be roiling they can be roiling
Perfect	V-ing perfect
I can have roiled you can have roiled she can have roiled we can have roiled you can have roiled they can have roiled	I can have been roiling you can have been roiling she can have been roiling we can have been roiling you can have been roiling they can have been roiling

Negation

Simple form	V-ing form
I cannot roil you cannot roil she cannot roil we cannot roil you cannot roil they cannot roil	I cannot be roiling you cannot be roiling she cannot be roiling we cannot be roiling you cannot be roiling they cannot be roiling
Perfect	V-ing perfect
I cannot have roiled you cannot have roiled she cannot have roiled we cannot have roiled you cannot have roiled they cannot have roiled	I cannot have been roiling you cannot have been roiling she cannot have been roiling we cannot have been roiling you cannot have been roiling they cannot have been roiling

Interrogative form

Simple form	V-ing form
can I roil? can you roil? can she roil? can we roil? can you roil? can they roil?	can I be roiling? can you be roiling? can she be roiling? can we be roiling? can you be roiling? can they be roiling?
Perfect	V-ing perfect
can I have roiled? can you have roiled? can she have roiled? can we have roiled? can you have roiled? can they have roiled?	can I have been roiling? can you have been roiling? can she have been roiling? can we have been roiling? can you have been roiling? can they have been roiling?

Interro-negative form

Simple form	V-ing form
can I not roil? can you not roil? can she not roil? can we not roil? can you not roil? can they not roil?	can I not be roiling? can you not be roiling? can she not be roiling? can we not be roiling? can you not be roiling? can they not be roiling?
Perfect	V-ing perfect
can I not have roiled? can you not have roiled? can she not have roiled? can we not have roiled? can you not have roiled? can they not have roiled?	can I not have been roiling? can you not have been roiling? can she not have been roiling? can we not have been roiling? can you not have been roiling? can they not have been roiling?