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