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