
Regular verb: slow - slowed - slowed
Simple form | V-ing form | 
| I must slow you must slow she must slow we must slow you must slow they must slow  | I must be slowing you must be slowing she must be slowing we must be slowing you must be slowing they must be slowing  | 
Perfect | V-ing perfect | 
| I must have slowed you must have slowed she must have slowed we must have slowed you must have slowed they must have slowed  | I must have been slowing you must have been slowing she must have been slowing we must have been slowing you must have been slowing they must have been slowing  | 
Simple form | V-ing form | 
| I mustn't slow you mustn't slow she mustn't slow we mustn't slow you mustn't slow they mustn't slow  | I mustn't be slowing you mustn't be slowing she mustn't be slowing we mustn't be slowing you mustn't be slowing they mustn't be slowing  | 
Perfect | V-ing perfect | 
| I mustn't have slowed you mustn't have slowed she mustn't have slowed we mustn't have slowed you mustn't have slowed they mustn't have slowed  | I mustn't have been slowing you mustn't have been slowing she mustn't have been slowing we mustn't have been slowing you mustn't have been slowing they mustn't have been slowing  | 
Simple form | V-ing form | 
| must I slow? must you slow? must she slow? must we slow? must you slow? must they slow?  | must I be slowing? must you be slowing? must she be slowing? must we be slowing? must you be slowing? must they be slowing?  | 
Perfect | V-ing perfect | 
| must I have slowed? must you have slowed? must she have slowed? must we have slowed? must you have slowed? must they have slowed?  | must I have been slowing? must you have been slowing? must she have been slowing? must we have been slowing? must you have been slowing? must they have been slowing?  | 
Simple form | V-ing form | 
| mustn't I slow? mustn't you slow? mustn't she slow? mustn't we slow? mustn't you slow? mustn't they slow?  | mustn't I be slowing? mustn't you be slowing? mustn't she be slowing? mustn't we be slowing? mustn't you be slowing? mustn't they be slowing?  | 
Perfect | V-ing perfect | 
| mustn't I have slowed? mustn't you have slowed? mustn't she have slowed? mustn't we have slowed? mustn't you have slowed? mustn't they have slowed?  | mustn't I have been slowing? mustn't you have been slowing? mustn't she have been slowing? mustn't we have been slowing? mustn't you have been slowing? mustn't they have been slowing?  |