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