must nail
Regular verb: nail - nailed- nailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?