Conjugación del verbo inglés
MUST ERR

Verbo regular: err - erred - erred

Afirmación

Forma simple	Forma con V-ing
I must err you must err she must err we must err you must err they must err	I must be erring you must be erring she must be erring we must be erring you must be erring they must be erring
Perfecto	Perfecto con V-ing
I must have erred you must have erred she must have erred we must have erred you must have erred they must have erred	I must have been erring you must have been erring she must have been erring we must have been erring you must have been erring they must have been erring

Negación

Forma simple	Forma con V-ing
I mustn't err you mustn't err she mustn't err we mustn't err you mustn't err they mustn't err	I mustn't be erring you mustn't be erring she mustn't be erring we mustn't be erring you mustn't be erring they mustn't be erring
Perfecto	Perfecto con V-ing
I mustn't have erred you mustn't have erred she mustn't have erred we mustn't have erred you mustn't have erred they mustn't have erred	I mustn't have been erring you mustn't have been erring she mustn't have been erring we mustn't have been erring you mustn't have been erring they mustn't have been erring

Forma interrogativa

Forma simple	Forma con V-ing
must I err? must you err? must she err? must we err? must you err? must they err?	must I be erring? must you be erring? must she be erring? must we be erring? must you be erring? must they be erring?
Perfecto	Perfecto con V-ing
must I have erred? must you have erred? must she have erred? must we have erred? must you have erred? must they have erred?	must I have been erring? must you have been erring? must she have been erring? must we have been erring? must you have been erring? must they have been erring?

Forma interro-negativa

Forma simple	Forma con V-ing
mustn't I err? mustn't you err? mustn't she err? mustn't we err? mustn't you err? mustn't they err?	mustn't I be erring? mustn't you be erring? mustn't she be erring? mustn't we be erring? mustn't you be erring? mustn't they be erring?
Perfecto	Perfecto con V-ing
mustn't I have erred? mustn't you have erred? mustn't she have erred? mustn't we have erred? mustn't you have erred? mustn't they have erred?	mustn't I have been erring? mustn't you have been erring? mustn't she have been erring? mustn't we have been erring? mustn't you have been erring? mustn't they have been erring?