must pretreat
Verbo regular: pretreat - pretreated- pretreated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must pretreat
you must pretreat
he must pretreat
we must pretreat
you must pretreat
they must pretreat 	I must be pretreating
you must be pretreating
he must be pretreating
we must be pretreating
you must be pretreating
they must be pretreating	I must have pretreated
you must have pretreated
he must have pretreated
we must have pretreated
you must have pretreated
they must have pretreated	I must have been pretreating
you must have been pretreating
he must have been pretreating
we must have been pretreating
you must have been pretreating
they must have been pretreating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't pretreat
you mustn't pretreat
he mustn't pretreat
we mustn't pretreat
you mustn't pretreat
they mustn't pretreat 	I mustn't be pretreating
you mustn't be pretreating
he mustn't be pretreating
we mustn't be pretreating
you mustn't be pretreating
they mustn't be pretreating	I mustn't have pretreated
you mustn't have pretreated
he mustn't have pretreated
we mustn't have pretreated
you mustn't have pretreated
they mustn't have pretreated	I mustn't have been pretreating
you mustn't have been pretreating
he mustn't have been pretreating
we mustn't have been pretreating
you mustn't have been pretreating
they mustn't have been pretreating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I pretreat?
must you pretreat?
must he pretreat?
must we pretreat?
must you pretreat?
must they pretreat? 	must I be pretreating?
must you be pretreating?
must he be pretreating?
must we be pretreating?
must you be pretreating?
must they be pretreating? 	must I have pretreated?
must you have pretreated?
must he have pretreated?
must we have pretreated?
must you have pretreated?
must they have pretreated? 	must I have been pretreating?
must you have been pretreating?
must he have been pretreating?
must we have been pretreating?
must you have been pretreating?
must they have been pretreating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I pretreat?
mustn't you pretreat?
mustn't he pretreat?
mustn't we pretreat?
mustn't you pretreat?
mustn't they pretreat? 	mustn't I be pretreating?
mustn't you be pretreating?
mustn't he be pretreating?
mustn't we be pretreating?
mustn't you be pretreating?
mustn't they be pretreating? 	mustn't I have pretreated?
mustn't you have pretreated?
mustn't he have pretreated?
mustn't we have pretreated?
mustn't you have pretreated?
mustn't they have pretreated? 	mustn't I have been pretreating?
mustn't you have been pretreating?
mustn't he have been pretreating?
mustn't we have been pretreating?
mustn't you have been pretreating?
mustn't they have been pretreating?