must contract
Verbo regular: contract - contracted- contracted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must contract
you must contract
he must contract
we must contract
you must contract
they must contract 	I must be contracting
you must be contracting
he must be contracting
we must be contracting
you must be contracting
they must be contracting	I must have contracted
you must have contracted
he must have contracted
we must have contracted
you must have contracted
they must have contracted	I must have been contracting
you must have been contracting
he must have been contracting
we must have been contracting
you must have been contracting
they must have been contracting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't contract
you mustn't contract
he mustn't contract
we mustn't contract
you mustn't contract
they mustn't contract 	I mustn't be contracting
you mustn't be contracting
he mustn't be contracting
we mustn't be contracting
you mustn't be contracting
they mustn't be contracting	I mustn't have contracted
you mustn't have contracted
he mustn't have contracted
we mustn't have contracted
you mustn't have contracted
they mustn't have contracted	I mustn't have been contracting
you mustn't have been contracting
he mustn't have been contracting
we mustn't have been contracting
you mustn't have been contracting
they mustn't have been contracting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I contract?
must you contract?
must he contract?
must we contract?
must you contract?
must they contract? 	must I be contracting?
must you be contracting?
must he be contracting?
must we be contracting?
must you be contracting?
must they be contracting? 	must I have contracted?
must you have contracted?
must he have contracted?
must we have contracted?
must you have contracted?
must they have contracted? 	must I have been contracting?
must you have been contracting?
must he have been contracting?
must we have been contracting?
must you have been contracting?
must they have been contracting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I contract?
mustn't you contract?
mustn't he contract?
mustn't we contract?
mustn't you contract?
mustn't they contract? 	mustn't I be contracting?
mustn't you be contracting?
mustn't he be contracting?
mustn't we be contracting?
mustn't you be contracting?
mustn't they be contracting? 	mustn't I have contracted?
mustn't you have contracted?
mustn't he have contracted?
mustn't we have contracted?
mustn't you have contracted?
mustn't they have contracted? 	mustn't I have been contracting?
mustn't you have been contracting?
mustn't he have been contracting?
mustn't we have been contracting?
mustn't you have been contracting?
mustn't they have been contracting?