Conjugación del verbo inglés
COULD TOUGH

Verbo regular: tough - toughed - toughed

Afirmación

Forma simple	Forma con V-ing
I could tough you could tough she could tough we could tough you could tough they could tough	I could be toughing you could be toughing she could be toughing we could be toughing you could be toughing they could be toughing
Perfecto	Perfecto con V-ing
I could have toughed you could have toughed she could have toughed we could have toughed you could have toughed they could have toughed	I could have been toughing you could have been toughing she could have been toughing we could have been toughing you could have been toughing they could have been toughing

Negación

Forma simple	Forma con V-ing
I couldn't tough you couldn't tough she couldn't tough we couldn't tough you couldn't tough they couldn't tough	I couldn't be toughing you couldn't be toughing she couldn't be toughing we couldn't be toughing you couldn't be toughing they couldn't be toughing
Perfecto	Perfecto con V-ing
I couldn't have toughed you couldn't have toughed she couldn't have toughed we couldn't have toughed you couldn't have toughed they couldn't have toughed	I couldn't have been toughing you couldn't have been toughing she couldn't have been toughing we couldn't have been toughing you couldn't have been toughing they couldn't have been toughing

Forma interrogativa

Forma simple	Forma con V-ing
could I tough? could you tough? could she tough? could we tough? could you tough? could they tough?	could I be toughing? could you be toughing? could she be toughing? could we be toughing? could you be toughing? could they be toughing?
Perfecto	Perfecto con V-ing
could I have toughed? could you have toughed? could she have toughed? could we have toughed? could you have toughed? could they have toughed?	could I have been toughing? could you have been toughing? could she have been toughing? could we have been toughing? could you have been toughing? could they have been toughing?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I tough? couldn't you tough? couldn't she tough? couldn't we tough? couldn't you tough? couldn't they tough?	couldn't I be toughing? couldn't you be toughing? couldn't she be toughing? couldn't we be toughing? couldn't you be toughing? couldn't they be toughing?
Perfecto	Perfecto con V-ing
couldn't I have toughed? couldn't you have toughed? couldn't she have toughed? couldn't we have toughed? couldn't you have toughed? couldn't they have toughed?	couldn't I have been toughing? couldn't you have been toughing? couldn't she have been toughing? couldn't we have been toughing? couldn't you have been toughing? couldn't they have been toughing?