I must presurround you must presurround he must presurround we must presurround you must presurround they must presurround
V-ing form
I must be presurrounding you must be presurrounding he must be presurrounding we must be presurrounding you must be presurrounding they must be presurrounding
Perfect
I must have presurrounded you must have presurrounded he must have presurrounded we must have presurrounded you must have presurrounded they must have presurrounded
V-ing perfect
I must have been presurrounding you must have been presurrounding he must have been presurrounding we must have been presurrounding you must have been presurrounding they must have been presurrounding
Negation
Simple form
I must not presurround you must not presurround he must not presurround we must not presurround you must not presurround they must not presurround
V-ing form
I must not be presurrounding you must not be presurrounding he must not be presurrounding we must not be presurrounding you must not be presurrounding they must not be presurrounding
Perfect
I must not have presurrounded you must not have presurrounded he must not have presurrounded we must not have presurrounded you must not have presurrounded they must not have presurrounded
V-ing perfect
I must not have been presurrounding you must not have been presurrounding he must not have been presurrounding we must not have been presurrounding you must not have been presurrounding they must not have been presurrounding
Interrogative form
Simple form
must I presurround? must you presurround? must he presurround? must we presurround? must you presurround? must they presurround?
V-ing form
must I be presurrounding? must you be presurrounding? must he be presurrounding? must we be presurrounding? must you be presurrounding? must they be presurrounding?
Perfect
must I have presurrounded? must you have presurrounded? must he have presurrounded? must we have presurrounded? must you have presurrounded? must they have presurrounded?
V-ing perfect
must I have been presurrounding? must you have been presurrounding? must he have been presurrounding? must we have been presurrounding? must you have been presurrounding? must they have been presurrounding?
Interro-negative form
Simple form
must I not presurround? must you not presurround? must he not presurround? must we not presurround? must you not presurround? must they not presurround?
V-ing form
must I not be presurrounding? must you not be presurrounding? must he not be presurrounding? must we not be presurrounding? must you not be presurrounding? must they not be presurrounding?
Perfect
must I not have presurrounded? must you not have presurrounded? must he not have presurrounded? must we not have presurrounded? must you not have presurrounded? must they not have presurrounded?
V-ing perfect
must I not have been presurrounding? must you not have been presurrounding? must he not have been presurrounding? must we not have been presurrounding? must you not have been presurrounding? must they not have been presurrounding?