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 cannot foil you cannot foil she cannot foil we cannot foil you cannot foil they cannot foil	I cannot be foiling you cannot be foiling she cannot be foiling we cannot be foiling you cannot be foiling they cannot be foiling
Perfect	V-ing perfect
I cannot have foiled you cannot have foiled she cannot have foiled we cannot have foiled you cannot have foiled they cannot have foiled	I cannot have been foiling you cannot have been foiling she cannot have been foiling we cannot have been foiling you cannot have been foiling they cannot 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 I not foil? can you not foil? can she not foil? can we not foil? can you not foil? can they not foil?	can I not be foiling? can you not be foiling? can she not be foiling? can we not be foiling? can you not be foiling? can they not be foiling?
Perfect	V-ing perfect
can I not have foiled? can you not have foiled? can she not have foiled? can we not have foiled? can you not have foiled? can they not have foiled?	can I not have been foiling? can you not have been foiling? can she not have been foiling? can we not have been foiling? can you not have been foiling? can they not have been foiling?