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 mustn't focus you mustn't focus he mustn't focus we mustn't focus you mustn't focus they mustn't focus
V-ing form
I mustn't be focusing you mustn't be focusing he mustn't be focusing we mustn't be focusing you mustn't be focusing they mustn't be focusing
Perfect
I mustn't have focused you mustn't have focused he mustn't have focused we mustn't have focused you mustn't have focused they mustn't have focused
V-ing perfect
I mustn't have been focusing you mustn't have been focusing he mustn't have been focusing we mustn't have been focusing you mustn't have been focusing they mustn't 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
mustn't I focus? mustn't you focus? mustn't he focus? mustn't we focus? mustn't you focus? mustn't they focus?
V-ing form
mustn't I be focusing? mustn't you be focusing? mustn't he be focusing? mustn't we be focusing? mustn't you be focusing? mustn't they be focusing?
Perfect
mustn't I have focused? mustn't you have focused? mustn't he have focused? mustn't we have focused? mustn't you have focused? mustn't they have focused?
V-ing perfect
mustn't I have been focusing? mustn't you have been focusing? mustn't he have been focusing? mustn't we have been focusing? mustn't you have been focusing? mustn't they have been focusing?