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 mustn't presurround you mustn't presurround he mustn't presurround we mustn't presurround you mustn't presurround they mustn't presurround
V-ing form
I mustn't be presurrounding you mustn't be presurrounding he mustn't be presurrounding we mustn't be presurrounding you mustn't be presurrounding they mustn't be presurrounding
Perfect
I mustn't have presurrounded you mustn't have presurrounded he mustn't have presurrounded we mustn't have presurrounded you mustn't have presurrounded they mustn't have presurrounded
V-ing perfect
I mustn't have been presurrounding you mustn't have been presurrounding he mustn't have been presurrounding we mustn't have been presurrounding you mustn't have been presurrounding they mustn't 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
mustn't I presurround? mustn't you presurround? mustn't he presurround? mustn't we presurround? mustn't you presurround? mustn't they presurround?
V-ing form
mustn't I be presurrounding? mustn't you be presurrounding? mustn't he be presurrounding? mustn't we be presurrounding? mustn't you be presurrounding? mustn't they be presurrounding?
Perfect
mustn't I have presurrounded? mustn't you have presurrounded? mustn't he have presurrounded? mustn't we have presurrounded? mustn't you have presurrounded? mustn't they have presurrounded?
V-ing perfect
mustn't I have been presurrounding? mustn't you have been presurrounding? mustn't he have been presurrounding? mustn't we have been presurrounding? mustn't you have been presurrounding? mustn't they have been presurrounding?