Conjugación del verbo inglés
MUST QUACK

Verbo regular: quack - quacked - quacked

Afirmación

Forma simple	Forma con V-ing
I must quack you must quack he must quack we must quack you must quack they must quack	I must be quacking you must be quacking he must be quacking we must be quacking you must be quacking they must be quacking
Perfecto	Perfecto con V-ing
I must have quacked you must have quacked he must have quacked we must have quacked you must have quacked they must have quacked	I must have been quacking you must have been quacking he must have been quacking we must have been quacking you must have been quacking they must have been quacking

Negación

Forma simple	Forma con V-ing
I mustn't quack you mustn't quack he mustn't quack we mustn't quack you mustn't quack they mustn't quack	I mustn't be quacking you mustn't be quacking he mustn't be quacking we mustn't be quacking you mustn't be quacking they mustn't be quacking
Perfecto	Perfecto con V-ing
I mustn't have quacked you mustn't have quacked he mustn't have quacked we mustn't have quacked you mustn't have quacked they mustn't have quacked	I mustn't have been quacking you mustn't have been quacking he mustn't have been quacking we mustn't have been quacking you mustn't have been quacking they mustn't have been quacking

Forma interrogativa

Forma simple	Forma con V-ing
must I quack? must you quack? must he quack? must we quack? must you quack? must they quack?	must I be quacking? must you be quacking? must he be quacking? must we be quacking? must you be quacking? must they be quacking?
Perfecto	Perfecto con V-ing
must I have quacked? must you have quacked? must he have quacked? must we have quacked? must you have quacked? must they have quacked?	must I have been quacking? must you have been quacking? must he have been quacking? must we have been quacking? must you have been quacking? must they have been quacking?

Forma interro-negativa

Forma simple	Forma con V-ing
mustn't I quack? mustn't you quack? mustn't he quack? mustn't we quack? mustn't you quack? mustn't they quack?	mustn't I be quacking? mustn't you be quacking? mustn't he be quacking? mustn't we be quacking? mustn't you be quacking? mustn't they be quacking?
Perfecto	Perfecto con V-ing
mustn't I have quacked? mustn't you have quacked? mustn't he have quacked? mustn't we have quacked? mustn't you have quacked? mustn't they have quacked?	mustn't I have been quacking? mustn't you have been quacking? mustn't he have been quacking? mustn't we have been quacking? mustn't you have been quacking? mustn't they have been quacking?