could thud
Verbo regular: thud - thudded- thudded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could thud
you could thud
he could thud
we could thud
you could thud
they could thud 	I could be thudding
you could be thudding
he could be thudding
we could be thudding
you could be thudding
they could be thudding	I could have thudded
you could have thudded
he could have thudded
we could have thudded
you could have thudded
they could have thudded	I could have been thudding
you could have been thudding
he could have been thudding
we could have been thudding
you could have been thudding
they could have been thudding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't thud
you couldn't thud
he couldn't thud
we couldn't thud
you couldn't thud
they couldn't thud 	I couldn't be thudding
you couldn't be thudding
he couldn't be thudding
we couldn't be thudding
you couldn't be thudding
they couldn't be thudding	I couldn't have thudded
you couldn't have thudded
he couldn't have thudded
we couldn't have thudded
you couldn't have thudded
they couldn't have thudded	I couldn't have been thudding
you couldn't have been thudding
he couldn't have been thudding
we couldn't have been thudding
you couldn't have been thudding
they couldn't have been thudding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I thud?
could you thud?
could he thud?
could we thud?
could you thud?
could they thud? 	could I be thudding?
could you be thudding?
could he be thudding?
could we be thudding?
could you be thudding?
could they be thudding? 	could I have thudded?
could you have thudded?
could he have thudded?
could we have thudded?
could you have thudded?
could they have thudded? 	could I have been thudding?
could you have been thudding?
could he have been thudding?
could we have been thudding?
could you have been thudding?
could they have been thudding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I thud?
couldn't you thud?
couldn't he thud?
couldn't we thud?
couldn't you thud?
couldn't they thud? 	couldn't I be thudding?
couldn't you be thudding?
couldn't he be thudding?
couldn't we be thudding?
couldn't you be thudding?
couldn't they be thudding? 	couldn't I have thudded?
couldn't you have thudded?
couldn't he have thudded?
couldn't we have thudded?
couldn't you have thudded?
couldn't they have thudded? 	couldn't I have been thudding?
couldn't you have been thudding?
couldn't he have been thudding?
couldn't we have been thudding?
couldn't you have been thudding?
couldn't they have been thudding?