I must stifle you must stifle she must stifle we must stifle you must stifle they must stifle
Forma com V-ing
I must be stifling you must be stifling she must be stifling we must be stifling you must be stifling they must be stifling
Perfeito
I must have stifled you must have stifled she must have stifled we must have stifled you must have stifled they must have stifled
Perfeito com V-ing
I must have been stifling you must have been stifling she must have been stifling we must have been stifling you must have been stifling they must have been stifling
Negação
Forma simple
I must not stifle you must not stifle she must not stifle we must not stifle you must not stifle they must not stifle
Forma com V-ing
I must not be stifling you must not be stifling she must not be stifling we must not be stifling you must not be stifling they must not be stifling
Perfeito
I must not have stifled you must not have stifled she must not have stifled we must not have stifled you must not have stifled they must not have stifled
Perfeito com V-ing
I must not have been stifling you must not have been stifling she must not have been stifling we must not have been stifling you must not have been stifling they must not have been stifling
Forma interrogativa
Forma simple
must I stifle? must you stifle? must she stifle? must we stifle? must you stifle? must they stifle?
Forma com V-ing
must I be stifling? must you be stifling? must she be stifling? must we be stifling? must you be stifling? must they be stifling?
Perfeito
must I have stifled? must you have stifled? must she have stifled? must we have stifled? must you have stifled? must they have stifled?
Perfeito com V-ing
must I have been stifling? must you have been stifling? must she have been stifling? must we have been stifling? must you have been stifling? must they have been stifling?
Forma interro-Negação
Forma simple
must I not stifle? must you not stifle? must she not stifle? must we not stifle? must you not stifle? must they not stifle?
Forma com V-ing
must I not be stifling? must you not be stifling? must she not be stifling? must we not be stifling? must you not be stifling? must they not be stifling?
Perfeito
must I not have stifled? must you not have stifled? must she not have stifled? must we not have stifled? must you not have stifled? must they not have stifled?
Perfeito com V-ing
must I not have been stifling? must you not have been stifling? must she not have been stifling? must we not have been stifling? must you not have been stifling? must they not have been stifling?