must trek
Verbo regular: trek - trekked- trekked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must trek
you must trek
he must trek
we must trek
you must trek
they must trek 	I must be trekking
you must be trekking
he must be trekking
we must be trekking
you must be trekking
they must be trekking	I must have trekked
you must have trekked
he must have trekked
we must have trekked
you must have trekked
they must have trekked	I must have been trekking
you must have been trekking
he must have been trekking
we must have been trekking
you must have been trekking
they must have been trekking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't trek
you mustn't trek
he mustn't trek
we mustn't trek
you mustn't trek
they mustn't trek 	I mustn't be trekking
you mustn't be trekking
he mustn't be trekking
we mustn't be trekking
you mustn't be trekking
they mustn't be trekking	I mustn't have trekked
you mustn't have trekked
he mustn't have trekked
we mustn't have trekked
you mustn't have trekked
they mustn't have trekked	I mustn't have been trekking
you mustn't have been trekking
he mustn't have been trekking
we mustn't have been trekking
you mustn't have been trekking
they mustn't have been trekking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I trek?
must you trek?
must he trek?
must we trek?
must you trek?
must they trek? 	must I be trekking?
must you be trekking?
must he be trekking?
must we be trekking?
must you be trekking?
must they be trekking? 	must I have trekked?
must you have trekked?
must he have trekked?
must we have trekked?
must you have trekked?
must they have trekked? 	must I have been trekking?
must you have been trekking?
must he have been trekking?
must we have been trekking?
must you have been trekking?
must they have been trekking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I trek?
mustn't you trek?
mustn't he trek?
mustn't we trek?
mustn't you trek?
mustn't they trek? 	mustn't I be trekking?
mustn't you be trekking?
mustn't he be trekking?
mustn't we be trekking?
mustn't you be trekking?
mustn't they be trekking? 	mustn't I have trekked?
mustn't you have trekked?
mustn't he have trekked?
mustn't we have trekked?
mustn't you have trekked?
mustn't they have trekked? 	mustn't I have been trekking?
mustn't you have been trekking?
mustn't he have been trekking?
mustn't we have been trekking?
mustn't you have been trekking?
mustn't they have been trekking?