English verb conjugation
MUST NAIL

Regular verb: nail - nailed - nailed

Affirmation

Simple form	V-ing form
I must nail you must nail he must nail we must nail you must nail they must nail	I must be nailing you must be nailing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he nail? must we nail? must you nail? must they nail?	must I be nailing? must you be nailing? must he 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 he 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 he 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 he 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 he 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 he 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 he have been nailing? mustn't we have been nailing? mustn't you have been nailing? mustn't they have been nailing?