must certificate
Verbo regular: certificate - certificated- certificated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must certificate
you must certificate
he must certificate
we must certificate
you must certificate
they must certificate 	I must be certificating
you must be certificating
he must be certificating
we must be certificating
you must be certificating
they must be certificating	I must have certificated
you must have certificated
he must have certificated
we must have certificated
you must have certificated
they must have certificated	I must have been certificating
you must have been certificating
he must have been certificating
we must have been certificating
you must have been certificating
they must have been certificating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not certificate
you must not certificate
he must not certificate
we must not certificate
you must not certificate
they must not certificate 	I must not be certificating
you must not be certificating
he must not be certificating
we must not be certificating
you must not be certificating
they must not be certificating	I must not have certificated
you must not have certificated
he must not have certificated
we must not have certificated
you must not have certificated
they must not have certificated	I must not have been certificating
you must not have been certificating
he must not have been certificating
we must not have been certificating
you must not have been certificating
they must not have been certificating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I certificate?
must you certificate?
must he certificate?
must we certificate?
must you certificate?
must they certificate? 	must I be certificating?
must you be certificating?
must he be certificating?
must we be certificating?
must you be certificating?
must they be certificating? 	must I have certificated?
must you have certificated?
must he have certificated?
must we have certificated?
must you have certificated?
must they have certificated? 	must I have been certificating?
must you have been certificating?
must he have been certificating?
must we have been certificating?
must you have been certificating?
must they have been certificating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not certificate?
must you not certificate?
must he not certificate?
must we not certificate?
must you not certificate?
must they not certificate? 	must I not be certificating?
must you not be certificating?
must he not be certificating?
must we not be certificating?
must you not be certificating?
must they not be certificating? 	must I not have certificated?
must you not have certificated?
must he not have certificated?
must we not have certificated?
must you not have certificated?
must they not have certificated? 	must I not have been certificating?
must you not have been certificating?
must he not have been certificating?
must we not have been certificating?
must you not have been certificating?
must they not have been certificating?