I must kneel you must kneel he must kneel we must kneel you must kneel they must kneel
V-ing form
I must be kneeling you must be kneeling he must be kneeling we must be kneeling you must be kneeling they must be kneeling
Perfect
I must have kneeled, knelt you must have kneeled, knelt he must have kneeled, knelt we must have kneeled, knelt you must have kneeled, knelt they must have kneeled, knelt
V-ing perfect
I must have been kneeling you must have been kneeling he must have been kneeling we must have been kneeling you must have been kneeling they must have been kneeling
Negation
Simple form
I mustn't kneel you mustn't kneel he mustn't kneel we mustn't kneel you mustn't kneel they mustn't kneel
V-ing form
I mustn't be kneeling you mustn't be kneeling he mustn't be kneeling we mustn't be kneeling you mustn't be kneeling they mustn't be kneeling
Perfect
I mustn't have kneeled, knelt you mustn't have kneeled, knelt he mustn't have kneeled, knelt we mustn't have kneeled, knelt you mustn't have kneeled, knelt they mustn't have kneeled, knelt
V-ing perfect
I mustn't have been kneeling you mustn't have been kneeling he mustn't have been kneeling we mustn't have been kneeling you mustn't have been kneeling they mustn't have been kneeling
Interrogative form
Simple form
must I kneel? must you kneel? must he kneel? must we kneel? must you kneel? must they kneel?
V-ing form
must I be kneeling? must you be kneeling? must he be kneeling? must we be kneeling? must you be kneeling? must they be kneeling?
Perfect
must I have kneeled, knelt? must you have kneeled, knelt? must he have kneeled, knelt? must we have kneeled, knelt? must you have kneeled, knelt? must they have kneeled, knelt?
V-ing perfect
must I have been kneeling? must you have been kneeling? must he have been kneeling? must we have been kneeling? must you have been kneeling? must they have been kneeling?
Interro-negative form
Simple form
mustn't I kneel? mustn't you kneel? mustn't he kneel? mustn't we kneel? mustn't you kneel? mustn't they kneel?
V-ing form
mustn't I be kneeling? mustn't you be kneeling? mustn't he be kneeling? mustn't we be kneeling? mustn't you be kneeling? mustn't they be kneeling?
Perfect
mustn't I have kneeled, knelt? mustn't you have kneeled, knelt? mustn't he have kneeled, knelt? mustn't we have kneeled, knelt? mustn't you have kneeled, knelt? mustn't they have kneeled, knelt?
V-ing perfect
mustn't I have been kneeling? mustn't you have been kneeling? mustn't he have been kneeling? mustn't we have been kneeling? mustn't you have been kneeling? mustn't they have been kneeling?