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