I must chirp you must chirp she must chirp we must chirp you must chirp they must chirp
Forma con V-ing
I must be chirping you must be chirping she must be chirping we must be chirping you must be chirping they must be chirping
Perfecto
I must have chirped you must have chirped she must have chirped we must have chirped you must have chirped they must have chirped
Perfecto con V-ing
I must have been chirping you must have been chirping she must have been chirping we must have been chirping you must have been chirping they must have been chirping
Negación
Forma simple
I mustn't chirp you mustn't chirp she mustn't chirp we mustn't chirp you mustn't chirp they mustn't chirp
Forma con V-ing
I mustn't be chirping you mustn't be chirping she mustn't be chirping we mustn't be chirping you mustn't be chirping they mustn't be chirping
Perfecto
I mustn't have chirped you mustn't have chirped she mustn't have chirped we mustn't have chirped you mustn't have chirped they mustn't have chirped
Perfecto con V-ing
I mustn't have been chirping you mustn't have been chirping she mustn't have been chirping we mustn't have been chirping you mustn't have been chirping they mustn't have been chirping
Forma interrogativa
Forma simple
must I chirp? must you chirp? must she chirp? must we chirp? must you chirp? must they chirp?
Forma con V-ing
must I be chirping? must you be chirping? must she be chirping? must we be chirping? must you be chirping? must they be chirping?
Perfecto
must I have chirped? must you have chirped? must she have chirped? must we have chirped? must you have chirped? must they have chirped?
Perfecto con V-ing
must I have been chirping? must you have been chirping? must she have been chirping? must we have been chirping? must you have been chirping? must they have been chirping?
Forma interro-negativa
Forma simple
mustn't I chirp? mustn't you chirp? mustn't she chirp? mustn't we chirp? mustn't you chirp? mustn't they chirp?
Forma con V-ing
mustn't I be chirping? mustn't you be chirping? mustn't she be chirping? mustn't we be chirping? mustn't you be chirping? mustn't they be chirping?
Perfecto
mustn't I have chirped? mustn't you have chirped? mustn't she have chirped? mustn't we have chirped? mustn't you have chirped? mustn't they have chirped?
Perfecto con V-ing
mustn't I have been chirping? mustn't you have been chirping? mustn't she have been chirping? mustn't we have been chirping? mustn't you have been chirping? mustn't they have been chirping?