must lifeguard
Verbo regular: lifeguard - lifeguarded- lifeguarded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must lifeguard
you must lifeguard
he must lifeguard
we must lifeguard
you must lifeguard
they must lifeguard 	I must be lifeguarding
you must be lifeguarding
he must be lifeguarding
we must be lifeguarding
you must be lifeguarding
they must be lifeguarding	I must have lifeguarded
you must have lifeguarded
he must have lifeguarded
we must have lifeguarded
you must have lifeguarded
they must have lifeguarded	I must have been lifeguarding
you must have been lifeguarding
he must have been lifeguarding
we must have been lifeguarding
you must have been lifeguarding
they must have been lifeguarding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not lifeguard
you must not lifeguard
he must not lifeguard
we must not lifeguard
you must not lifeguard
they must not lifeguard 	I must not be lifeguarding
you must not be lifeguarding
he must not be lifeguarding
we must not be lifeguarding
you must not be lifeguarding
they must not be lifeguarding	I must not have lifeguarded
you must not have lifeguarded
he must not have lifeguarded
we must not have lifeguarded
you must not have lifeguarded
they must not have lifeguarded	I must not have been lifeguarding
you must not have been lifeguarding
he must not have been lifeguarding
we must not have been lifeguarding
you must not have been lifeguarding
they must not have been lifeguarding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I lifeguard?
must you lifeguard?
must he lifeguard?
must we lifeguard?
must you lifeguard?
must they lifeguard? 	must I be lifeguarding?
must you be lifeguarding?
must he be lifeguarding?
must we be lifeguarding?
must you be lifeguarding?
must they be lifeguarding? 	must I have lifeguarded?
must you have lifeguarded?
must he have lifeguarded?
must we have lifeguarded?
must you have lifeguarded?
must they have lifeguarded? 	must I have been lifeguarding?
must you have been lifeguarding?
must he have been lifeguarding?
must we have been lifeguarding?
must you have been lifeguarding?
must they have been lifeguarding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not lifeguard?
must you not lifeguard?
must he not lifeguard?
must we not lifeguard?
must you not lifeguard?
must they not lifeguard? 	must I not be lifeguarding?
must you not be lifeguarding?
must he not be lifeguarding?
must we not be lifeguarding?
must you not be lifeguarding?
must they not be lifeguarding? 	must I not have lifeguarded?
must you not have lifeguarded?
must he not have lifeguarded?
must we not have lifeguarded?
must you not have lifeguarded?
must they not have lifeguarded? 	must I not have been lifeguarding?
must you not have been lifeguarding?
must he not have been lifeguarding?
must we not have been lifeguarding?
must you not have been lifeguarding?
must they not have been lifeguarding?