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