I must befriend you must befriend he must befriend we must befriend you must befriend they must befriend
V-ing form
I must be befriending you must be befriending he must be befriending we must be befriending you must be befriending they must be befriending
Perfect
I must have befriended you must have befriended he must have befriended we must have befriended you must have befriended they must have befriended
V-ing perfect
I must have been befriending you must have been befriending he must have been befriending we must have been befriending you must have been befriending they must have been befriending
Negation
Simple form
I must not befriend you must not befriend he must not befriend we must not befriend you must not befriend they must not befriend
V-ing form
I must not be befriending you must not be befriending he must not be befriending we must not be befriending you must not be befriending they must not be befriending
Perfect
I must not have befriended you must not have befriended he must not have befriended we must not have befriended you must not have befriended they must not have befriended
V-ing perfect
I must not have been befriending you must not have been befriending he must not have been befriending we must not have been befriending you must not have been befriending they must not have been befriending
Interrogative form
Simple form
must I befriend? must you befriend? must he befriend? must we befriend? must you befriend? must they befriend?
V-ing form
must I be befriending? must you be befriending? must he be befriending? must we be befriending? must you be befriending? must they be befriending?
Perfect
must I have befriended? must you have befriended? must he have befriended? must we have befriended? must you have befriended? must they have befriended?
V-ing perfect
must I have been befriending? must you have been befriending? must he have been befriending? must we have been befriending? must you have been befriending? must they have been befriending?
Interro-negative form
Simple form
must I not befriend? must you not befriend? must he not befriend? must we not befriend? must you not befriend? must they not befriend?
V-ing form
must I not be befriending? must you not be befriending? must he not be befriending? must we not be befriending? must you not be befriending? must they not be befriending?
Perfect
must I not have befriended? must you not have befriended? must he not have befriended? must we not have befriended? must you not have befriended? must they not have befriended?
V-ing perfect
must I not have been befriending? must you not have been befriending? must he not have been befriending? must we not have been befriending? must you not have been befriending? must they not have been befriending?