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 must not surround
you must not surround
she must not surround
we must not surround
you must not surround
they must not surround 	I must not be surrounding
you must not be surrounding
she must not be surrounding
we must not be surrounding
you must not be surrounding
they must not be surrounding	I must not have surrounded
you must not have surrounded
she must not have surrounded
we must not have surrounded
you must not have surrounded
they must not have surrounded	I must not have been surrounding
you must not have been surrounding
she must not have been surrounding
we must not have been surrounding
you must not have been surrounding
they must not 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 	
must I not surround?
must you not surround?
must she not surround?
must we not surround?
must you not surround?
must they not surround? 	must I not be surrounding?
must you not be surrounding?
must she not be surrounding?
must we not be surrounding?
must you not be surrounding?
must they not be surrounding? 	must I not have surrounded?
must you not have surrounded?
must she not have surrounded?
must we not have surrounded?
must you not have surrounded?
must they not have surrounded? 	must I not have been surrounding?
must you not have been surrounding?
must she not have been surrounding?
must we not have been surrounding?
must you not have been surrounding?
must they not have been surrounding?