I must cough you must cough she must cough we must cough you must cough they must cough
Forma con V-ing
I must be coughing you must be coughing she must be coughing we must be coughing you must be coughing they must be coughing
Perfecto
I must have coughed you must have coughed she must have coughed we must have coughed you must have coughed they must have coughed
Perfecto con V-ing
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
Negación
Forma simple
I must not cough you must not cough she must not cough we must not cough you must not cough they must not cough
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
must I cough? must you cough? must she cough? must we cough? must you cough? must they cough?
Forma con V-ing
must I be coughing? must you be coughing? must she be coughing? must we be coughing? must you be coughing? must they be coughing?
Perfecto
must I have coughed? must you have coughed? must she have coughed? must we have coughed? must you have coughed? must they have coughed?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
must I not cough? must you not cough? must she not cough? must we not cough? must you not cough? must they not cough?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?