can doubt
Verbo regular: doubt - doubted- doubted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can doubt
you can doubt
she can doubt
we can doubt
you can doubt
they can doubt 	I can be doubting
you can be doubting
she can be doubting
we can be doubting
you can be doubting
they can be doubting	I can have doubted
you can have doubted
she can have doubted
we can have doubted
you can have doubted
they can have doubted	I can have been doubting
you can have been doubting
she can have been doubting
we can have been doubting
you can have been doubting
they can have been doubting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot doubt
you cannot doubt
she cannot doubt
we cannot doubt
you cannot doubt
they cannot doubt 	I cannot be doubting
you cannot be doubting
she cannot be doubting
we cannot be doubting
you cannot be doubting
they cannot be doubting	I cannot have doubted
you cannot have doubted
she cannot have doubted
we cannot have doubted
you cannot have doubted
they cannot have doubted	I cannot have been doubting
you cannot have been doubting
she cannot have been doubting
we cannot have been doubting
you cannot have been doubting
they cannot have been doubting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I doubt?
can you doubt?
can she doubt?
can we doubt?
can you doubt?
can they doubt? 	can I be doubting?
can you be doubting?
can she be doubting?
can we be doubting?
can you be doubting?
can they be doubting? 	can I have doubted?
can you have doubted?
can she have doubted?
can we have doubted?
can you have doubted?
can they have doubted? 	can I have been doubting?
can you have been doubting?
can she have been doubting?
can we have been doubting?
can you have been doubting?
can they have been doubting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not doubt?
can you not doubt?
can she not doubt?
can we not doubt?
can you not doubt?
can they not doubt? 	can I not be doubting?
can you not be doubting?
can she not be doubting?
can we not be doubting?
can you not be doubting?
can they not be doubting? 	can I not have doubted?
can you not have doubted?
can she not have doubted?
can we not have doubted?
can you not have doubted?
can they not have doubted? 	can I not have been doubting?
can you not have been doubting?
can she not have been doubting?
can we not have been doubting?
can you not have been doubting?
can they not have been doubting?