I must circle you must circle he must circle we must circle you must circle they must circle
V-ing form
I must be circling you must be circling he must be circling we must be circling you must be circling they must be circling
Perfect
I must have circled you must have circled he must have circled we must have circled you must have circled they must have circled
V-ing perfect
I must have been circling you must have been circling he must have been circling we must have been circling you must have been circling they must have been circling
Negation
Simple form
I mustn't circle you mustn't circle he mustn't circle we mustn't circle you mustn't circle they mustn't circle
V-ing form
I mustn't be circling you mustn't be circling he mustn't be circling we mustn't be circling you mustn't be circling they mustn't be circling
Perfect
I mustn't have circled you mustn't have circled he mustn't have circled we mustn't have circled you mustn't have circled they mustn't have circled
V-ing perfect
I mustn't have been circling you mustn't have been circling he mustn't have been circling we mustn't have been circling you mustn't have been circling they mustn't have been circling
Interrogative form
Simple form
must I circle? must you circle? must he circle? must we circle? must you circle? must they circle?
V-ing form
must I be circling? must you be circling? must he be circling? must we be circling? must you be circling? must they be circling?
Perfect
must I have circled? must you have circled? must he have circled? must we have circled? must you have circled? must they have circled?
V-ing perfect
must I have been circling? must you have been circling? must he have been circling? must we have been circling? must you have been circling? must they have been circling?
Interro-negative form
Simple form
mustn't I circle? mustn't you circle? mustn't he circle? mustn't we circle? mustn't you circle? mustn't they circle?
V-ing form
mustn't I be circling? mustn't you be circling? mustn't he be circling? mustn't we be circling? mustn't you be circling? mustn't they be circling?
Perfect
mustn't I have circled? mustn't you have circled? mustn't he have circled? mustn't we have circled? mustn't you have circled? mustn't they have circled?
V-ing perfect
mustn't I have been circling? mustn't you have been circling? mustn't he have been circling? mustn't we have been circling? mustn't you have been circling? mustn't they have been circling?