Cuidado, este verbo pode não existir, a conjugação é dada como exemplo.
Afirmação
Forma simple
I can stiffer you can stiffer he can stiffer we can stiffer you can stiffer they can stiffer
Forma com V-ing
I can be stiffering you can be stiffering he can be stiffering we can be stiffering you can be stiffering they can be stiffering
Perfeito
I can have stiffered you can have stiffered he can have stiffered we can have stiffered you can have stiffered they can have stiffered
Perfeito com V-ing
I can have been stiffering you can have been stiffering he can have been stiffering we can have been stiffering you can have been stiffering they can have been stiffering
Negação
Forma simple
I cannot stiffer you cannot stiffer he cannot stiffer we cannot stiffer you cannot stiffer they cannot stiffer
Forma com V-ing
I cannot be stiffering you cannot be stiffering he cannot be stiffering we cannot be stiffering you cannot be stiffering they cannot be stiffering
Perfeito
I cannot have stiffered you cannot have stiffered he cannot have stiffered we cannot have stiffered you cannot have stiffered they cannot have stiffered
Perfeito com V-ing
I cannot have been stiffering you cannot have been stiffering he cannot have been stiffering we cannot have been stiffering you cannot have been stiffering they cannot have been stiffering
Forma interrogativa
Forma simple
can I stiffer? can you stiffer? can he stiffer? can we stiffer? can you stiffer? can they stiffer?
Forma com V-ing
can I be stiffering? can you be stiffering? can he be stiffering? can we be stiffering? can you be stiffering? can they be stiffering?
Perfeito
can I have stiffered? can you have stiffered? can he have stiffered? can we have stiffered? can you have stiffered? can they have stiffered?
Perfeito com V-ing
can I have been stiffering? can you have been stiffering? can he have been stiffering? can we have been stiffering? can you have been stiffering? can they have been stiffering?
Forma interro-Negação
Forma simple
can I not stiffer? can you not stiffer? can he not stiffer? can we not stiffer? can you not stiffer? can they not stiffer?
Forma com V-ing
can I not be stiffering? can you not be stiffering? can he not be stiffering? can we not be stiffering? can you not be stiffering? can they not be stiffering?
Perfeito
can I not have stiffered? can you not have stiffered? can he not have stiffered? can we not have stiffered? can you not have stiffered? can they not have stiffered?
Perfeito com V-ing
can I not have been stiffering? can you not have been stiffering? can he not have been stiffering? can we not have been stiffering? can you not have been stiffering? can they not have been stiffering?