English verb conjugation
CAN ROIL

Regular verb: roil - roiled - roiled

Affirmation

Simple form	V-ing form
I can roil you can roil he can roil we can roil you can roil they can roil	I can be roiling you can be roiling he 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 he 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 he 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 he cannot roil we cannot roil you cannot roil they cannot roil	I cannot be roiling you cannot be roiling he 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 he 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 he 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 he roil? can we roil? can you roil? can they roil?	can I be roiling? can you be roiling? can he 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 he 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 he 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 he 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 he 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 he 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 he not have been roiling? can we not have been roiling? can you not have been roiling? can they not have been roiling?