must travel
Verbo regular: travel - travelled- travelled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must travel
you must travel
she must travel
we must travel
you must travel
they must travel 	I must be travelling
you must be travelling
she must be travelling
we must be travelling
you must be travelling
they must be travelling	I must have travelled
you must have travelled
she must have travelled
we must have travelled
you must have travelled
they must have travelled	I must have been travelling
you must have been travelling
she must have been travelling
we must have been travelling
you must have been travelling
they must have been travelling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't travel
you mustn't travel
she mustn't travel
we mustn't travel
you mustn't travel
they mustn't travel 	I mustn't be travelling
you mustn't be travelling
she mustn't be travelling
we mustn't be travelling
you mustn't be travelling
they mustn't be travelling	I mustn't have travelled
you mustn't have travelled
she mustn't have travelled
we mustn't have travelled
you mustn't have travelled
they mustn't have travelled	I mustn't have been travelling
you mustn't have been travelling
she mustn't have been travelling
we mustn't have been travelling
you mustn't have been travelling
they mustn't have been travelling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I travel?
must you travel?
must she travel?
must we travel?
must you travel?
must they travel? 	must I be travelling?
must you be travelling?
must she be travelling?
must we be travelling?
must you be travelling?
must they be travelling? 	must I have travelled?
must you have travelled?
must she have travelled?
must we have travelled?
must you have travelled?
must they have travelled? 	must I have been travelling?
must you have been travelling?
must she have been travelling?
must we have been travelling?
must you have been travelling?
must they have been travelling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I travel?
mustn't you travel?
mustn't she travel?
mustn't we travel?
mustn't you travel?
mustn't they travel? 	mustn't I be travelling?
mustn't you be travelling?
mustn't she be travelling?
mustn't we be travelling?
mustn't you be travelling?
mustn't they be travelling? 	mustn't I have travelled?
mustn't you have travelled?
mustn't she have travelled?
mustn't we have travelled?
mustn't you have travelled?
mustn't they have travelled? 	mustn't I have been travelling?
mustn't you have been travelling?
mustn't she have been travelling?
mustn't we have been travelling?
mustn't you have been travelling?
mustn't they have been travelling?