Regular verb: cough - coughed - coughed
Simple form | V-ing form |
I must cough you must cough he must cough we must cough you must cough they must cough | I must be coughing you must be coughing he must be coughing we must be coughing you must be coughing they must be coughing |
Perfect | V-ing perfect |
I must have coughed you must have coughed he must have coughed we must have coughed you must have coughed they must have coughed | I must have been coughing you must have been coughing he must have been coughing we must have been coughing you must have been coughing they must have been coughing |
Simple form | V-ing form |
I must not cough you must not cough he must not cough we must not cough you must not cough they must not cough | I must not be coughing you must not be coughing he must not be coughing we must not be coughing you must not be coughing they must not be coughing |
Perfect | V-ing perfect |
I must not have coughed you must not have coughed he must not have coughed we must not have coughed you must not have coughed they must not have coughed | I must not have been coughing you must not have been coughing he must not have been coughing we must not have been coughing you must not have been coughing they must not have been coughing |
Simple form | V-ing form |
must I cough? must you cough? must he cough? must we cough? must you cough? must they cough? | must I be coughing? must you be coughing? must he be coughing? must we be coughing? must you be coughing? must they be coughing? |
Perfect | V-ing perfect |
must I have coughed? must you have coughed? must he have coughed? must we have coughed? must you have coughed? must they have coughed? | must I have been coughing? must you have been coughing? must he have been coughing? must we have been coughing? must you have been coughing? must they have been coughing? |
Simple form | V-ing form |
must I not cough? must you not cough? must he not cough? must we not cough? must you not cough? must they not cough? | must I not be coughing? must you not be coughing? must he not be coughing? must we not be coughing? must you not be coughing? must they not be coughing? |
Perfect | V-ing perfect |
must I not have coughed? must you not have coughed? must he not have coughed? must we not have coughed? must you not have coughed? must they not have coughed? | must I not have been coughing? must you not have been coughing? must he not have been coughing? must we not have been coughing? must you not have been coughing? must they not have been coughing? |