must suction
Verbo regular: suction - suctioned- suctioned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must suction
you must suction
he must suction
we must suction
you must suction
they must suction 	I must be suctioning
you must be suctioning
he must be suctioning
we must be suctioning
you must be suctioning
they must be suctioning	I must have suctioned
you must have suctioned
he must have suctioned
we must have suctioned
you must have suctioned
they must have suctioned	I must have been suctioning
you must have been suctioning
he must have been suctioning
we must have been suctioning
you must have been suctioning
they must have been suctioning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not suction
you must not suction
he must not suction
we must not suction
you must not suction
they must not suction 	I must not be suctioning
you must not be suctioning
he must not be suctioning
we must not be suctioning
you must not be suctioning
they must not be suctioning	I must not have suctioned
you must not have suctioned
he must not have suctioned
we must not have suctioned
you must not have suctioned
they must not have suctioned	I must not have been suctioning
you must not have been suctioning
he must not have been suctioning
we must not have been suctioning
you must not have been suctioning
they must not have been suctioning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I suction?
must you suction?
must he suction?
must we suction?
must you suction?
must they suction? 	must I be suctioning?
must you be suctioning?
must he be suctioning?
must we be suctioning?
must you be suctioning?
must they be suctioning? 	must I have suctioned?
must you have suctioned?
must he have suctioned?
must we have suctioned?
must you have suctioned?
must they have suctioned? 	must I have been suctioning?
must you have been suctioning?
must he have been suctioning?
must we have been suctioning?
must you have been suctioning?
must they have been suctioning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not suction?
must you not suction?
must he not suction?
must we not suction?
must you not suction?
must they not suction? 	must I not be suctioning?
must you not be suctioning?
must he not be suctioning?
must we not be suctioning?
must you not be suctioning?
must they not be suctioning? 	must I not have suctioned?
must you not have suctioned?
must he not have suctioned?
must we not have suctioned?
must you not have suctioned?
must they not have suctioned? 	must I not have been suctioning?
must you not have been suctioning?
must he not have been suctioning?
must we not have been suctioning?
must you not have been suctioning?
must they not have been suctioning?