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