I must encircle you must encircle she must encircle we must encircle you must encircle they must encircle
V-ing form
I must be encircling you must be encircling she must be encircling we must be encircling you must be encircling they must be encircling
Perfect
I must have encircled you must have encircled she must have encircled we must have encircled you must have encircled they must have encircled
V-ing perfect
I must have been encircling you must have been encircling she must have been encircling we must have been encircling you must have been encircling they must have been encircling
Negation
Simple form
I mustn't encircle you mustn't encircle she mustn't encircle we mustn't encircle you mustn't encircle they mustn't encircle
V-ing form
I mustn't be encircling you mustn't be encircling she mustn't be encircling we mustn't be encircling you mustn't be encircling they mustn't be encircling
Perfect
I mustn't have encircled you mustn't have encircled she mustn't have encircled we mustn't have encircled you mustn't have encircled they mustn't have encircled
V-ing perfect
I mustn't have been encircling you mustn't have been encircling she mustn't have been encircling we mustn't have been encircling you mustn't have been encircling they mustn't have been encircling
Interrogative form
Simple form
must I encircle? must you encircle? must she encircle? must we encircle? must you encircle? must they encircle?
V-ing form
must I be encircling? must you be encircling? must she be encircling? must we be encircling? must you be encircling? must they be encircling?
Perfect
must I have encircled? must you have encircled? must she have encircled? must we have encircled? must you have encircled? must they have encircled?
V-ing perfect
must I have been encircling? must you have been encircling? must she have been encircling? must we have been encircling? must you have been encircling? must they have been encircling?
Interro-negative form
Simple form
mustn't I encircle? mustn't you encircle? mustn't she encircle? mustn't we encircle? mustn't you encircle? mustn't they encircle?
V-ing form
mustn't I be encircling? mustn't you be encircling? mustn't she be encircling? mustn't we be encircling? mustn't you be encircling? mustn't they be encircling?
Perfect
mustn't I have encircled? mustn't you have encircled? mustn't she have encircled? mustn't we have encircled? mustn't you have encircled? mustn't they have encircled?
V-ing perfect
mustn't I have been encircling? mustn't you have been encircling? mustn't she have been encircling? mustn't we have been encircling? mustn't you have been encircling? mustn't they have been encircling?