I must steer you must steer she must steer we must steer you must steer they must steer
V-ing form
I must be steering you must be steering she must be steering we must be steering you must be steering they must be steering
Perfect
I must have steered you must have steered she must have steered we must have steered you must have steered they must have steered
V-ing perfect
I must have been steering you must have been steering she must have been steering we must have been steering you must have been steering they must have been steering
Negation
Simple form
I mustn't steer you mustn't steer she mustn't steer we mustn't steer you mustn't steer they mustn't steer
V-ing form
I mustn't be steering you mustn't be steering she mustn't be steering we mustn't be steering you mustn't be steering they mustn't be steering
Perfect
I mustn't have steered you mustn't have steered she mustn't have steered we mustn't have steered you mustn't have steered they mustn't have steered
V-ing perfect
I mustn't have been steering you mustn't have been steering she mustn't have been steering we mustn't have been steering you mustn't have been steering they mustn't have been steering
Interrogative form
Simple form
must I steer? must you steer? must she steer? must we steer? must you steer? must they steer?
V-ing form
must I be steering? must you be steering? must she be steering? must we be steering? must you be steering? must they be steering?
Perfect
must I have steered? must you have steered? must she have steered? must we have steered? must you have steered? must they have steered?
V-ing perfect
must I have been steering? must you have been steering? must she have been steering? must we have been steering? must you have been steering? must they have been steering?
Interro-negative form
Simple form
mustn't I steer? mustn't you steer? mustn't she steer? mustn't we steer? mustn't you steer? mustn't they steer?
V-ing form
mustn't I be steering? mustn't you be steering? mustn't she be steering? mustn't we be steering? mustn't you be steering? mustn't they be steering?
Perfect
mustn't I have steered? mustn't you have steered? mustn't she have steered? mustn't we have steered? mustn't you have steered? mustn't they have steered?
V-ing perfect
mustn't I have been steering? mustn't you have been steering? mustn't she have been steering? mustn't we have been steering? mustn't you have been steering? mustn't they have been steering?