English verb conjugation
MUST NAIL

Regular verb: nail - nailed - nailed

Affirmation

Simple form	V-ing form
I must nail you must nail she must nail we must nail you must nail they must nail	I must be nailing you must be nailing she must be nailing we must be nailing you must be nailing they must be nailing
Perfect	V-ing perfect
I must have nailed you must have nailed she must have nailed we must have nailed you must have nailed they must have nailed	I must have been nailing you must have been nailing she must have been nailing we must have been nailing you must have been nailing they must have been nailing

Negation

Simple form	V-ing form
I mustn't nail you mustn't nail she mustn't nail we mustn't nail you mustn't nail they mustn't nail	I mustn't be nailing you mustn't be nailing she mustn't be nailing we mustn't be nailing you mustn't be nailing they mustn't be nailing
Perfect	V-ing perfect
I mustn't have nailed you mustn't have nailed she mustn't have nailed we mustn't have nailed you mustn't have nailed they mustn't have nailed	I mustn't have been nailing you mustn't have been nailing she mustn't have been nailing we mustn't have been nailing you mustn't have been nailing they mustn't have been nailing

Interrogative form

Simple form	V-ing form
must I nail? must you nail? must she nail? must we nail? must you nail? must they nail?	must I be nailing? must you be nailing? must she be nailing? must we be nailing? must you be nailing? must they be nailing?
Perfect	V-ing perfect
must I have nailed? must you have nailed? must she have nailed? must we have nailed? must you have nailed? must they have nailed?	must I have been nailing? must you have been nailing? must she have been nailing? must we have been nailing? must you have been nailing? must they have been nailing?

Interro-negative form

Simple form	V-ing form
mustn't I nail? mustn't you nail? mustn't she nail? mustn't we nail? mustn't you nail? mustn't they nail?	mustn't I be nailing? mustn't you be nailing? mustn't she be nailing? mustn't we be nailing? mustn't you be nailing? mustn't they be nailing?
Perfect	V-ing perfect
mustn't I have nailed? mustn't you have nailed? mustn't she have nailed? mustn't we have nailed? mustn't you have nailed? mustn't they have nailed?	mustn't I have been nailing? mustn't you have been nailing? mustn't she have been nailing? mustn't we have been nailing? mustn't you have been nailing? mustn't they have been nailing?