could doubt
Verbo regular: doubt - doubted- doubted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could doubt
you could doubt
he could doubt
we could doubt
you could doubt
they could doubt 	I could be doubting
you could be doubting
he could be doubting
we could be doubting
you could be doubting
they could be doubting	I could have doubted
you could have doubted
he could have doubted
we could have doubted
you could have doubted
they could have doubted	I could have been doubting
you could have been doubting
he could have been doubting
we could have been doubting
you could have been doubting
they could have been doubting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not doubt
you could not doubt
he could not doubt
we could not doubt
you could not doubt
they could not doubt 	I could not be doubting
you could not be doubting
he could not be doubting
we could not be doubting
you could not be doubting
they could not be doubting	I could not have doubted
you could not have doubted
he could not have doubted
we could not have doubted
you could not have doubted
they could not have doubted	I could not have been doubting
you could not have been doubting
he could not have been doubting
we could not have been doubting
you could not have been doubting
they could not have been doubting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I doubt?
could you doubt?
could he doubt?
could we doubt?
could you doubt?
could they doubt? 	could I be doubting?
could you be doubting?
could he be doubting?
could we be doubting?
could you be doubting?
could they be doubting? 	could I have doubted?
could you have doubted?
could he have doubted?
could we have doubted?
could you have doubted?
could they have doubted? 	could I have been doubting?
could you have been doubting?
could he have been doubting?
could we have been doubting?
could you have been doubting?
could they have been doubting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not doubt?
could you not doubt?
could he not doubt?
could we not doubt?
could you not doubt?
could they not doubt? 	could I not be doubting?
could you not be doubting?
could he not be doubting?
could we not be doubting?
could you not be doubting?
could they not be doubting? 	could I not have doubted?
could you not have doubted?
could he not have doubted?
could we not have doubted?
could you not have doubted?
could they not have doubted? 	could I not have been doubting?
could you not have been doubting?
could he not have been doubting?
could we not have been doubting?
could you not have been doubting?
could they not have been doubting?