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