English verb conjugation
MUST FOIL

Regular verb: foil - foiled - foiled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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