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