Conjugación del verbo inglés
COULD LENGTHEN

Verbo regular: lengthen - lengthened - lengthened

Afirmación

Forma simple	Forma con V-ing
I could lengthen you could lengthen he could lengthen we could lengthen you could lengthen they could lengthen	I could be lengthening you could be lengthening he could be lengthening we could be lengthening you could be lengthening they could be lengthening
Perfecto	Perfecto con V-ing
I could have lengthened you could have lengthened he could have lengthened we could have lengthened you could have lengthened they could have lengthened	I could have been lengthening you could have been lengthening he could have been lengthening we could have been lengthening you could have been lengthening they could have been lengthening

Negación

Forma simple	Forma con V-ing
I couldn't lengthen you couldn't lengthen he couldn't lengthen we couldn't lengthen you couldn't lengthen they couldn't lengthen	I couldn't be lengthening you couldn't be lengthening he couldn't be lengthening we couldn't be lengthening you couldn't be lengthening they couldn't be lengthening
Perfecto	Perfecto con V-ing
I couldn't have lengthened you couldn't have lengthened he couldn't have lengthened we couldn't have lengthened you couldn't have lengthened they couldn't have lengthened	I couldn't have been lengthening you couldn't have been lengthening he couldn't have been lengthening we couldn't have been lengthening you couldn't have been lengthening they couldn't have been lengthening

Forma interrogativa

Forma simple	Forma con V-ing
could I lengthen? could you lengthen? could he lengthen? could we lengthen? could you lengthen? could they lengthen?	could I be lengthening? could you be lengthening? could he be lengthening? could we be lengthening? could you be lengthening? could they be lengthening?
Perfecto	Perfecto con V-ing
could I have lengthened? could you have lengthened? could he have lengthened? could we have lengthened? could you have lengthened? could they have lengthened?	could I have been lengthening? could you have been lengthening? could he have been lengthening? could we have been lengthening? could you have been lengthening? could they have been lengthening?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I lengthen? couldn't you lengthen? couldn't he lengthen? couldn't we lengthen? couldn't you lengthen? couldn't they lengthen?	couldn't I be lengthening? couldn't you be lengthening? couldn't he be lengthening? couldn't we be lengthening? couldn't you be lengthening? couldn't they be lengthening?
Perfecto	Perfecto con V-ing
couldn't I have lengthened? couldn't you have lengthened? couldn't he have lengthened? couldn't we have lengthened? couldn't you have lengthened? couldn't they have lengthened?	couldn't I have been lengthening? couldn't you have been lengthening? couldn't he have been lengthening? couldn't we have been lengthening? couldn't you have been lengthening? couldn't they have been lengthening?