I must focus you must focus he must focus we must focus you must focus they must focus
V-ing form
I must be focusing you must be focusing he must be focusing we must be focusing you must be focusing they must be focusing
Perfect
I must have focused you must have focused he must have focused we must have focused you must have focused they must have focused
V-ing perfect
I must have been focusing you must have been focusing he must have been focusing we must have been focusing you must have been focusing they must have been focusing
Negation
Simple form
I must not focus you must not focus he must not focus we must not focus you must not focus they must not focus
V-ing form
I must not be focusing you must not be focusing he must not be focusing we must not be focusing you must not be focusing they must not be focusing
Perfect
I must not have focused you must not have focused he must not have focused we must not have focused you must not have focused they must not have focused
V-ing perfect
I must not have been focusing you must not have been focusing he must not have been focusing we must not have been focusing you must not have been focusing they must not have been focusing
Interrogative form
Simple form
must I focus? must you focus? must he focus? must we focus? must you focus? must they focus?
V-ing form
must I be focusing? must you be focusing? must he be focusing? must we be focusing? must you be focusing? must they be focusing?
Perfect
must I have focused? must you have focused? must he have focused? must we have focused? must you have focused? must they have focused?
V-ing perfect
must I have been focusing? must you have been focusing? must he have been focusing? must we have been focusing? must you have been focusing? must they have been focusing?
Interro-negative form
Simple form
must I not focus? must you not focus? must he not focus? must we not focus? must you not focus? must they not focus?
V-ing form
must I not be focusing? must you not be focusing? must he not be focusing? must we not be focusing? must you not be focusing? must they not be focusing?
Perfect
must I not have focused? must you not have focused? must he not have focused? must we not have focused? must you not have focused? must they not have focused?
V-ing perfect
must I not have been focusing? must you not have been focusing? must he not have been focusing? must we not have been focusing? must you not have been focusing? must they not have been focusing?