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