Regular verb: sing sing - sing singed - sing singed
Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must sing sing you must sing sing he must sing sing we must sing sing you must sing sing they must sing sing
V-ing form
I must be sing singing you must be sing singing he must be sing singing we must be sing singing you must be sing singing they must be sing singing
Perfect
I must have sing singed you must have sing singed he must have sing singed we must have sing singed you must have sing singed they must have sing singed
V-ing perfect
I must have been sing singing you must have been sing singing he must have been sing singing we must have been sing singing you must have been sing singing they must have been sing singing
Negation
Simple form
I must not sing sing you must not sing sing he must not sing sing we must not sing sing you must not sing sing they must not sing sing
V-ing form
I must not be sing singing you must not be sing singing he must not be sing singing we must not be sing singing you must not be sing singing they must not be sing singing
Perfect
I must not have sing singed you must not have sing singed he must not have sing singed we must not have sing singed you must not have sing singed they must not have sing singed
V-ing perfect
I must not have been sing singing you must not have been sing singing he must not have been sing singing we must not have been sing singing you must not have been sing singing they must not have been sing singing
Interrogative form
Simple form
must I sing sing? must you sing sing? must he sing sing? must we sing sing? must you sing sing? must they sing sing?
V-ing form
must I be sing singing? must you be sing singing? must he be sing singing? must we be sing singing? must you be sing singing? must they be sing singing?
Perfect
must I have sing singed? must you have sing singed? must he have sing singed? must we have sing singed? must you have sing singed? must they have sing singed?
V-ing perfect
must I have been sing singing? must you have been sing singing? must he have been sing singing? must we have been sing singing? must you have been sing singing? must they have been sing singing?
Interro-negative form
Simple form
must I not sing sing? must you not sing sing? must he not sing sing? must we not sing sing? must you not sing sing? must they not sing sing?
V-ing form
must I not be sing singing? must you not be sing singing? must he not be sing singing? must we not be sing singing? must you not be sing singing? must they not be sing singing?
Perfect
must I not have sing singed? must you not have sing singed? must he not have sing singed? must we not have sing singed? must you not have sing singed? must they not have sing singed?
V-ing perfect
must I not have been sing singing? must you not have been sing singing? must he not have been sing singing? must we not have been sing singing? must you not have been sing singing? must they not have been sing singing?