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