I must howl you must howl she must howl we must howl you must howl they must howl
Forma com V-ing
I must be howling you must be howling she must be howling we must be howling you must be howling they must be howling
Perfeito
I must have howled you must have howled she must have howled we must have howled you must have howled they must have howled
Perfeito com V-ing
I must have been howling you must have been howling she must have been howling we must have been howling you must have been howling they must have been howling
Negação
Forma simple
I must not howl you must not howl she must not howl we must not howl you must not howl they must not howl
Forma com V-ing
I must not be howling you must not be howling she must not be howling we must not be howling you must not be howling they must not be howling
Perfeito
I must not have howled you must not have howled she must not have howled we must not have howled you must not have howled they must not have howled
Perfeito com V-ing
I must not have been howling you must not have been howling she must not have been howling we must not have been howling you must not have been howling they must not have been howling
Forma interrogativa
Forma simple
must I howl? must you howl? must she howl? must we howl? must you howl? must they howl?
Forma com V-ing
must I be howling? must you be howling? must she be howling? must we be howling? must you be howling? must they be howling?
Perfeito
must I have howled? must you have howled? must she have howled? must we have howled? must you have howled? must they have howled?
Perfeito com V-ing
must I have been howling? must you have been howling? must she have been howling? must we have been howling? must you have been howling? must they have been howling?
Forma interro-Negação
Forma simple
must I not howl? must you not howl? must she not howl? must we not howl? must you not howl? must they not howl?
Forma com V-ing
must I not be howling? must you not be howling? must she not be howling? must we not be howling? must you not be howling? must they not be howling?
Perfeito
must I not have howled? must you not have howled? must she not have howled? must we not have howled? must you not have howled? must they not have howled?
Perfeito com V-ing
must I not have been howling? must you not have been howling? must she not have been howling? must we not have been howling? must you not have been howling? must they not have been howling?