must participate
Verbo regular: participate - participated- participated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must participate
you must participate
he must participate
we must participate
you must participate
they must participate 	I must be participating
you must be participating
he must be participating
we must be participating
you must be participating
they must be participating	I must have participated
you must have participated
he must have participated
we must have participated
you must have participated
they must have participated	I must have been participating
you must have been participating
he must have been participating
we must have been participating
you must have been participating
they must have been participating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not participate
you must not participate
he must not participate
we must not participate
you must not participate
they must not participate 	I must not be participating
you must not be participating
he must not be participating
we must not be participating
you must not be participating
they must not be participating	I must not have participated
you must not have participated
he must not have participated
we must not have participated
you must not have participated
they must not have participated	I must not have been participating
you must not have been participating
he must not have been participating
we must not have been participating
you must not have been participating
they must not have been participating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I participate?
must you participate?
must he participate?
must we participate?
must you participate?
must they participate? 	must I be participating?
must you be participating?
must he be participating?
must we be participating?
must you be participating?
must they be participating? 	must I have participated?
must you have participated?
must he have participated?
must we have participated?
must you have participated?
must they have participated? 	must I have been participating?
must you have been participating?
must he have been participating?
must we have been participating?
must you have been participating?
must they have been participating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not participate?
must you not participate?
must he not participate?
must we not participate?
must you not participate?
must they not participate? 	must I not be participating?
must you not be participating?
must he not be participating?
must we not be participating?
must you not be participating?
must they not be participating? 	must I not have participated?
must you not have participated?
must he not have participated?
must we not have participated?
must you not have participated?
must they not have participated? 	must I not have been participating?
must you not have been participating?
must he not have been participating?
must we not have been participating?
must you not have been participating?
must they not have been participating?