Conjugación del verbo inglés
COULD DERIVE

Verbo regular: derive - derived - derived

Afirmación

Forma simple	Forma con V-ing
I could derive you could derive he could derive we could derive you could derive they could derive	I could be deriving you could be deriving he could be deriving we could be deriving you could be deriving they could be deriving
Perfecto	Perfecto con V-ing
I could have derived you could have derived he could have derived we could have derived you could have derived they could have derived	I could have been deriving you could have been deriving he could have been deriving we could have been deriving you could have been deriving they could have been deriving

Negación

Forma simple	Forma con V-ing
I couldn't derive you couldn't derive he couldn't derive we couldn't derive you couldn't derive they couldn't derive	I couldn't be deriving you couldn't be deriving he couldn't be deriving we couldn't be deriving you couldn't be deriving they couldn't be deriving
Perfecto	Perfecto con V-ing
I couldn't have derived you couldn't have derived he couldn't have derived we couldn't have derived you couldn't have derived they couldn't have derived	I couldn't have been deriving you couldn't have been deriving he couldn't have been deriving we couldn't have been deriving you couldn't have been deriving they couldn't have been deriving

Forma interrogativa

Forma simple	Forma con V-ing
could I derive? could you derive? could he derive? could we derive? could you derive? could they derive?	could I be deriving? could you be deriving? could he be deriving? could we be deriving? could you be deriving? could they be deriving?
Perfecto	Perfecto con V-ing
could I have derived? could you have derived? could he have derived? could we have derived? could you have derived? could they have derived?	could I have been deriving? could you have been deriving? could he have been deriving? could we have been deriving? could you have been deriving? could they have been deriving?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I derive? couldn't you derive? couldn't he derive? couldn't we derive? couldn't you derive? couldn't they derive?	couldn't I be deriving? couldn't you be deriving? couldn't he be deriving? couldn't we be deriving? couldn't you be deriving? couldn't they be deriving?
Perfecto	Perfecto con V-ing
couldn't I have derived? couldn't you have derived? couldn't he have derived? couldn't we have derived? couldn't you have derived? couldn't they have derived?	couldn't I have been deriving? couldn't you have been deriving? couldn't he have been deriving? couldn't we have been deriving? couldn't you have been deriving? couldn't they have been deriving?