must fortify
Verbo regular: fortify - fortified- fortified

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must fortify
you must fortify
he must fortify
we must fortify
you must fortify
they must fortify 	I must be fortifying
you must be fortifying
he must be fortifying
we must be fortifying
you must be fortifying
they must be fortifying	I must have fortified
you must have fortified
he must have fortified
we must have fortified
you must have fortified
they must have fortified	I must have been fortifying
you must have been fortifying
he must have been fortifying
we must have been fortifying
you must have been fortifying
they must have been fortifying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not fortify
you must not fortify
he must not fortify
we must not fortify
you must not fortify
they must not fortify 	I must not be fortifying
you must not be fortifying
he must not be fortifying
we must not be fortifying
you must not be fortifying
they must not be fortifying	I must not have fortified
you must not have fortified
he must not have fortified
we must not have fortified
you must not have fortified
they must not have fortified	I must not have been fortifying
you must not have been fortifying
he must not have been fortifying
we must not have been fortifying
you must not have been fortifying
they must not have been fortifying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I fortify?
must you fortify?
must he fortify?
must we fortify?
must you fortify?
must they fortify? 	must I be fortifying?
must you be fortifying?
must he be fortifying?
must we be fortifying?
must you be fortifying?
must they be fortifying? 	must I have fortified?
must you have fortified?
must he have fortified?
must we have fortified?
must you have fortified?
must they have fortified? 	must I have been fortifying?
must you have been fortifying?
must he have been fortifying?
must we have been fortifying?
must you have been fortifying?
must they have been fortifying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not fortify?
must you not fortify?
must he not fortify?
must we not fortify?
must you not fortify?
must they not fortify? 	must I not be fortifying?
must you not be fortifying?
must he not be fortifying?
must we not be fortifying?
must you not be fortifying?
must they not be fortifying? 	must I not have fortified?
must you not have fortified?
must he not have fortified?
must we not have fortified?
must you not have fortified?
must they not have fortified? 	must I not have been fortifying?
must you not have been fortifying?
must he not have been fortifying?
must we not have been fortifying?
must you not have been fortifying?
must they not have been fortifying?