must surround
Regular verb: surround - surrounded- surrounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must surround
you must surround
she must surround
we must surround
you must surround
they must surround 	I must be surrounding
you must be surrounding
she must be surrounding
we must be surrounding
you must be surrounding
they must be surrounding	I must have surrounded
you must have surrounded
she must have surrounded
we must have surrounded
you must have surrounded
they must have surrounded	I must have been surrounding
you must have been surrounding
she must have been surrounding
we must have been surrounding
you must have been surrounding
they must have been surrounding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't surround
you mustn't surround
she mustn't surround
we mustn't surround
you mustn't surround
they mustn't surround 	I mustn't be surrounding
you mustn't be surrounding
she mustn't be surrounding
we mustn't be surrounding
you mustn't be surrounding
they mustn't be surrounding	I mustn't have surrounded
you mustn't have surrounded
she mustn't have surrounded
we mustn't have surrounded
you mustn't have surrounded
they mustn't have surrounded	I mustn't have been surrounding
you mustn't have been surrounding
she mustn't have been surrounding
we mustn't have been surrounding
you mustn't have been surrounding
they mustn't have been surrounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I surround?
must you surround?
must she surround?
must we surround?
must you surround?
must they surround? 	must I be surrounding?
must you be surrounding?
must she be surrounding?
must we be surrounding?
must you be surrounding?
must they be surrounding? 	must I have surrounded?
must you have surrounded?
must she have surrounded?
must we have surrounded?
must you have surrounded?
must they have surrounded? 	must I have been surrounding?
must you have been surrounding?
must she have been surrounding?
must we have been surrounding?
must you have been surrounding?
must they have been surrounding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I surround?
mustn't you surround?
mustn't she surround?
mustn't we surround?
mustn't you surround?
mustn't they surround? 	mustn't I be surrounding?
mustn't you be surrounding?
mustn't she be surrounding?
mustn't we be surrounding?
mustn't you be surrounding?
mustn't they be surrounding? 	mustn't I have surrounded?
mustn't you have surrounded?
mustn't she have surrounded?
mustn't we have surrounded?
mustn't you have surrounded?
mustn't they have surrounded? 	mustn't I have been surrounding?
mustn't you have been surrounding?
mustn't she have been surrounding?
mustn't we have been surrounding?
mustn't you have been surrounding?
mustn't they have been surrounding?