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