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