must percolate
Verbo regular: percolate - percolated- percolated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must percolate
you must percolate
he must percolate
we must percolate
you must percolate
they must percolate 	I must be percolating
you must be percolating
he must be percolating
we must be percolating
you must be percolating
they must be percolating	I must have percolated
you must have percolated
he must have percolated
we must have percolated
you must have percolated
they must have percolated	I must have been percolating
you must have been percolating
he must have been percolating
we must have been percolating
you must have been percolating
they must have been percolating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't percolate
you mustn't percolate
he mustn't percolate
we mustn't percolate
you mustn't percolate
they mustn't percolate 	I mustn't be percolating
you mustn't be percolating
he mustn't be percolating
we mustn't be percolating
you mustn't be percolating
they mustn't be percolating	I mustn't have percolated
you mustn't have percolated
he mustn't have percolated
we mustn't have percolated
you mustn't have percolated
they mustn't have percolated	I mustn't have been percolating
you mustn't have been percolating
he mustn't have been percolating
we mustn't have been percolating
you mustn't have been percolating
they mustn't have been percolating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I percolate?
must you percolate?
must he percolate?
must we percolate?
must you percolate?
must they percolate? 	must I be percolating?
must you be percolating?
must he be percolating?
must we be percolating?
must you be percolating?
must they be percolating? 	must I have percolated?
must you have percolated?
must he have percolated?
must we have percolated?
must you have percolated?
must they have percolated? 	must I have been percolating?
must you have been percolating?
must he have been percolating?
must we have been percolating?
must you have been percolating?
must they have been percolating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I percolate?
mustn't you percolate?
mustn't he percolate?
mustn't we percolate?
mustn't you percolate?
mustn't they percolate? 	mustn't I be percolating?
mustn't you be percolating?
mustn't he be percolating?
mustn't we be percolating?
mustn't you be percolating?
mustn't they be percolating? 	mustn't I have percolated?
mustn't you have percolated?
mustn't he have percolated?
mustn't we have percolated?
mustn't you have percolated?
mustn't they have percolated? 	mustn't I have been percolating?
mustn't you have been percolating?
mustn't he have been percolating?
mustn't we have been percolating?
mustn't you have been percolating?
mustn't they have been percolating?