must submerse
Regular verb: submerse - submersed- submersed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must submerse
you must submerse
he must submerse
we must submerse
you must submerse
they must submerse 	I must be submersing
you must be submersing
he must be submersing
we must be submersing
you must be submersing
they must be submersing	I must have submersed
you must have submersed
he must have submersed
we must have submersed
you must have submersed
they must have submersed	I must have been submersing
you must have been submersing
he must have been submersing
we must have been submersing
you must have been submersing
they must have been submersing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't submerse
you mustn't submerse
he mustn't submerse
we mustn't submerse
you mustn't submerse
they mustn't submerse 	I mustn't be submersing
you mustn't be submersing
he mustn't be submersing
we mustn't be submersing
you mustn't be submersing
they mustn't be submersing	I mustn't have submersed
you mustn't have submersed
he mustn't have submersed
we mustn't have submersed
you mustn't have submersed
they mustn't have submersed	I mustn't have been submersing
you mustn't have been submersing
he mustn't have been submersing
we mustn't have been submersing
you mustn't have been submersing
they mustn't have been submersing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I submerse?
must you submerse?
must he submerse?
must we submerse?
must you submerse?
must they submerse? 	must I be submersing?
must you be submersing?
must he be submersing?
must we be submersing?
must you be submersing?
must they be submersing? 	must I have submersed?
must you have submersed?
must he have submersed?
must we have submersed?
must you have submersed?
must they have submersed? 	must I have been submersing?
must you have been submersing?
must he have been submersing?
must we have been submersing?
must you have been submersing?
must they have been submersing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I submerse?
mustn't you submerse?
mustn't he submerse?
mustn't we submerse?
mustn't you submerse?
mustn't they submerse? 	mustn't I be submersing?
mustn't you be submersing?
mustn't he be submersing?
mustn't we be submersing?
mustn't you be submersing?
mustn't they be submersing? 	mustn't I have submersed?
mustn't you have submersed?
mustn't he have submersed?
mustn't we have submersed?
mustn't you have submersed?
mustn't they have submersed? 	mustn't I have been submersing?
mustn't you have been submersing?
mustn't he have been submersing?
mustn't we have been submersing?
mustn't you have been submersing?
mustn't they have been submersing?