Regular verb: prefer - preferred - preferred
Simple form | V-ing form |
I must prefer you must prefer he must prefer we must prefer you must prefer they must prefer | I must be preferring you must be preferring he must be preferring we must be preferring you must be preferring they must be preferring |
Perfect | V-ing perfect |
I must have preferred you must have preferred he must have preferred we must have preferred you must have preferred they must have preferred | I must have been preferring you must have been preferring he must have been preferring we must have been preferring you must have been preferring they must have been preferring |
Simple form | V-ing form |
I mustn't prefer you mustn't prefer he mustn't prefer we mustn't prefer you mustn't prefer they mustn't prefer | I mustn't be preferring you mustn't be preferring he mustn't be preferring we mustn't be preferring you mustn't be preferring they mustn't be preferring |
Perfect | V-ing perfect |
I mustn't have preferred you mustn't have preferred he mustn't have preferred we mustn't have preferred you mustn't have preferred they mustn't have preferred | I mustn't have been preferring you mustn't have been preferring he mustn't have been preferring we mustn't have been preferring you mustn't have been preferring they mustn't have been preferring |
Simple form | V-ing form |
must I prefer? must you prefer? must he prefer? must we prefer? must you prefer? must they prefer? | must I be preferring? must you be preferring? must he be preferring? must we be preferring? must you be preferring? must they be preferring? |
Perfect | V-ing perfect |
must I have preferred? must you have preferred? must he have preferred? must we have preferred? must you have preferred? must they have preferred? | must I have been preferring? must you have been preferring? must he have been preferring? must we have been preferring? must you have been preferring? must they have been preferring? |
Simple form | V-ing form |
mustn't I prefer? mustn't you prefer? mustn't he prefer? mustn't we prefer? mustn't you prefer? mustn't they prefer? | mustn't I be preferring? mustn't you be preferring? mustn't he be preferring? mustn't we be preferring? mustn't you be preferring? mustn't they be preferring? |
Perfect | V-ing perfect |
mustn't I have preferred? mustn't you have preferred? mustn't he have preferred? mustn't we have preferred? mustn't you have preferred? mustn't they have preferred? | mustn't I have been preferring? mustn't you have been preferring? mustn't he have been preferring? mustn't we have been preferring? mustn't you have been preferring? mustn't they have been preferring? |