must surround
Regular verb: surround - surrounded- surrounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must surround
you must surround
he must surround
we must surround
you must surround
they must surround 	I must be surrounding
you must be surrounding
he must be surrounding
we must be surrounding
you must be surrounding
they must be surrounding	I must have surrounded
you must have surrounded
he 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
he 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
he 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
he 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
he 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
he 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 he surround?
must we surround?
must you surround?
must they surround? 	must I be surrounding?
must you be surrounding?
must he be surrounding?
must we be surrounding?
must you be surrounding?
must they be surrounding? 	must I have surrounded?
must you have surrounded?
must he 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 he 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 he 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 he 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 he 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 he not have been surrounding?
must we not have been surrounding?
must you not have been surrounding?
must they not have been surrounding?