must look
Verbo regular: look - looked- looked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must look
you must look
he must look
we must look
you must look
they must look 	I must be looking
you must be looking
he must be looking
we must be looking
you must be looking
they must be looking	I must have looked
you must have looked
he must have looked
we must have looked
you must have looked
they must have looked	I must have been looking
you must have been looking
he must have been looking
we must have been looking
you must have been looking
they must have been looking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't look
you mustn't look
he mustn't look
we mustn't look
you mustn't look
they mustn't look 	I mustn't be looking
you mustn't be looking
he mustn't be looking
we mustn't be looking
you mustn't be looking
they mustn't be looking	I mustn't have looked
you mustn't have looked
he mustn't have looked
we mustn't have looked
you mustn't have looked
they mustn't have looked	I mustn't have been looking
you mustn't have been looking
he mustn't have been looking
we mustn't have been looking
you mustn't have been looking
they mustn't have been looking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I look?
must you look?
must he look?
must we look?
must you look?
must they look? 	must I be looking?
must you be looking?
must he be looking?
must we be looking?
must you be looking?
must they be looking? 	must I have looked?
must you have looked?
must he have looked?
must we have looked?
must you have looked?
must they have looked? 	must I have been looking?
must you have been looking?
must he have been looking?
must we have been looking?
must you have been looking?
must they have been looking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I look?
mustn't you look?
mustn't he look?
mustn't we look?
mustn't you look?
mustn't they look? 	mustn't I be looking?
mustn't you be looking?
mustn't he be looking?
mustn't we be looking?
mustn't you be looking?
mustn't they be looking? 	mustn't I have looked?
mustn't you have looked?
mustn't he have looked?
mustn't we have looked?
mustn't you have looked?
mustn't they have looked? 	mustn't I have been looking?
mustn't you have been looking?
mustn't he have been looking?
mustn't we have been looking?
mustn't you have been looking?
mustn't they have been looking?