English verb conjugation
CAN FOIL

Regular verb: foil - foiled - foiled

Affirmation

Simple form	V-ing form
I can foil you can foil she can foil we can foil you can foil they can foil	I can be foiling you can be foiling she can be foiling we can be foiling you can be foiling they can be foiling
Perfect	V-ing perfect
I can have foiled you can have foiled she can have foiled we can have foiled you can have foiled they can have foiled	I can have been foiling you can have been foiling she can have been foiling we can have been foiling you can have been foiling they can have been foiling

Negation

Simple form	V-ing form
I can't foil you can't foil she can't foil we can't foil you can't foil they can't foil	I can't be foiling you can't be foiling she can't be foiling we can't be foiling you can't be foiling they can't be foiling
Perfect	V-ing perfect
I can't have foiled you can't have foiled she can't have foiled we can't have foiled you can't have foiled they can't have foiled	I can't have been foiling you can't have been foiling she can't have been foiling we can't have been foiling you can't have been foiling they can't have been foiling

Interrogative form

Simple form	V-ing form
can I foil? can you foil? can she foil? can we foil? can you foil? can they foil?	can I be foiling? can you be foiling? can she be foiling? can we be foiling? can you be foiling? can they be foiling?
Perfect	V-ing perfect
can I have foiled? can you have foiled? can she have foiled? can we have foiled? can you have foiled? can they have foiled?	can I have been foiling? can you have been foiling? can she have been foiling? can we have been foiling? can you have been foiling? can they have been foiling?

Interro-negative form

Simple form	V-ing form
can't I foil? can't you foil? can't she foil? can't we foil? can't you foil? can't they foil?	can't I be foiling? can't you be foiling? can't she be foiling? can't we be foiling? can't you be foiling? can't they be foiling?
Perfect	V-ing perfect
can't I have foiled? can't you have foiled? can't she have foiled? can't we have foiled? can't you have foiled? can't they have foiled?	can't I have been foiling? can't you have been foiling? can't she have been foiling? can't we have been foiling? can't you have been foiling? can't they have been foiling?