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