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 can't roil you can't roil he can't roil we can't roil you can't roil they can't roil	I can't be roiling you can't be roiling he can't be roiling we can't be roiling you can't be roiling they can't be roiling
Perfect	V-ing perfect
I can't have roiled you can't have roiled he can't have roiled we can't have roiled you can't have roiled they can't have roiled	I can't have been roiling you can't have been roiling he can't have been roiling we can't have been roiling you can't have been roiling they can't 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't I roil? can't you roil? can't he roil? can't we roil? can't you roil? can't they roil?	can't I be roiling? can't you be roiling? can't he be roiling? can't we be roiling? can't you be roiling? can't they be roiling?
Perfect	V-ing perfect
can't I have roiled? can't you have roiled? can't he have roiled? can't we have roiled? can't you have roiled? can't they have roiled?	can't I have been roiling? can't you have been roiling? can't he have been roiling? can't we have been roiling? can't you have been roiling? can't they have been roiling?