must percolate
Regular verb: percolate - percolated- percolated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must percolate
you must percolate
she must percolate
we must percolate
you must percolate
they must percolate 	I must be percolating
you must be percolating
she must be percolating
we must be percolating
you must be percolating
they must be percolating	I must have percolated
you must have percolated
she 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
she must have been percolating
we must have been percolating
you must have been percolating
they must have been percolating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't percolate
you mustn't percolate
she 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
she 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
she 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
she mustn't have been percolating
we mustn't have been percolating
you mustn't have been percolating
they mustn't have been percolating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I percolate?
must you percolate?
must she percolate?
must we percolate?
must you percolate?
must they percolate? 	must I be percolating?
must you be percolating?
must she be percolating?
must we be percolating?
must you be percolating?
must they be percolating? 	must I have percolated?
must you have percolated?
must she 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 she have been percolating?
must we have been percolating?
must you have been percolating?
must they have been percolating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I percolate?
mustn't you percolate?
mustn't she 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 she 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 she 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 she have been percolating?
mustn't we have been percolating?
mustn't you have been percolating?
mustn't they have been percolating?