must erect
Verbo regular: erect - erected- erected

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must erect
you must erect
she must erect
we must erect
you must erect
they must erect 	I must be erecting
you must be erecting
she must be erecting
we must be erecting
you must be erecting
they must be erecting	I must have erected
you must have erected
she must have erected
we must have erected
you must have erected
they must have erected	I must have been erecting
you must have been erecting
she must have been erecting
we must have been erecting
you must have been erecting
they must have been erecting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't erect
you mustn't erect
she mustn't erect
we mustn't erect
you mustn't erect
they mustn't erect 	I mustn't be erecting
you mustn't be erecting
she mustn't be erecting
we mustn't be erecting
you mustn't be erecting
they mustn't be erecting	I mustn't have erected
you mustn't have erected
she mustn't have erected
we mustn't have erected
you mustn't have erected
they mustn't have erected	I mustn't have been erecting
you mustn't have been erecting
she mustn't have been erecting
we mustn't have been erecting
you mustn't have been erecting
they mustn't have been erecting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I erect?
must you erect?
must she erect?
must we erect?
must you erect?
must they erect? 	must I be erecting?
must you be erecting?
must she be erecting?
must we be erecting?
must you be erecting?
must they be erecting? 	must I have erected?
must you have erected?
must she have erected?
must we have erected?
must you have erected?
must they have erected? 	must I have been erecting?
must you have been erecting?
must she have been erecting?
must we have been erecting?
must you have been erecting?
must they have been erecting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I erect?
mustn't you erect?
mustn't she erect?
mustn't we erect?
mustn't you erect?
mustn't they erect? 	mustn't I be erecting?
mustn't you be erecting?
mustn't she be erecting?
mustn't we be erecting?
mustn't you be erecting?
mustn't they be erecting? 	mustn't I have erected?
mustn't you have erected?
mustn't she have erected?
mustn't we have erected?
mustn't you have erected?
mustn't they have erected? 	mustn't I have been erecting?
mustn't you have been erecting?
mustn't she have been erecting?
mustn't we have been erecting?
mustn't you have been erecting?
mustn't they have been erecting?