must crouch
Verbo regular: crouch - crouched- crouched

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must crouch
you must crouch
he must crouch
we must crouch
you must crouch
they must crouch 	I must be crouching
you must be crouching
he must be crouching
we must be crouching
you must be crouching
they must be crouching	I must have crouched
you must have crouched
he must have crouched
we must have crouched
you must have crouched
they must have crouched	I must have been crouching
you must have been crouching
he must have been crouching
we must have been crouching
you must have been crouching
they must have been crouching	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not crouch
you must not crouch
he must not crouch
we must not crouch
you must not crouch
they must not crouch 	I must not be crouching
you must not be crouching
he must not be crouching
we must not be crouching
you must not be crouching
they must not be crouching	I must not have crouched
you must not have crouched
he must not have crouched
we must not have crouched
you must not have crouched
they must not have crouched	I must not have been crouching
you must not have been crouching
he must not have been crouching
we must not have been crouching
you must not have been crouching
they must not have been crouching	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I crouch?
must you crouch?
must he crouch?
must we crouch?
must you crouch?
must they crouch? 	must I be crouching?
must you be crouching?
must he be crouching?
must we be crouching?
must you be crouching?
must they be crouching? 	must I have crouched?
must you have crouched?
must he have crouched?
must we have crouched?
must you have crouched?
must they have crouched? 	must I have been crouching?
must you have been crouching?
must he have been crouching?
must we have been crouching?
must you have been crouching?
must they have been crouching? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not crouch?
must you not crouch?
must he not crouch?
must we not crouch?
must you not crouch?
must they not crouch? 	must I not be crouching?
must you not be crouching?
must he not be crouching?
must we not be crouching?
must you not be crouching?
must they not be crouching? 	must I not have crouched?
must you not have crouched?
must he not have crouched?
must we not have crouched?
must you not have crouched?
must they not have crouched? 	must I not have been crouching?
must you not have been crouching?
must he not have been crouching?
must we not have been crouching?
must you not have been crouching?
must they not have been crouching?