Conjugación del verbo inglés
COULD SUBSTANTIATE

Verbo regular: substantiate - substantiated - substantiated

Afirmación

Forma simple	Forma con V-ing
I could substantiate you could substantiate he could substantiate we could substantiate you could substantiate they could substantiate	I could be substantiating you could be substantiating he could be substantiating we could be substantiating you could be substantiating they could be substantiating
Perfecto	Perfecto con V-ing
I could have substantiated you could have substantiated he could have substantiated we could have substantiated you could have substantiated they could have substantiated	I could have been substantiating you could have been substantiating he could have been substantiating we could have been substantiating you could have been substantiating they could have been substantiating

Negación

Forma simple	Forma con V-ing
I couldn't substantiate you couldn't substantiate he couldn't substantiate we couldn't substantiate you couldn't substantiate they couldn't substantiate	I couldn't be substantiating you couldn't be substantiating he couldn't be substantiating we couldn't be substantiating you couldn't be substantiating they couldn't be substantiating
Perfecto	Perfecto con V-ing
I couldn't have substantiated you couldn't have substantiated he couldn't have substantiated we couldn't have substantiated you couldn't have substantiated they couldn't have substantiated	I couldn't have been substantiating you couldn't have been substantiating he couldn't have been substantiating we couldn't have been substantiating you couldn't have been substantiating they couldn't have been substantiating

Forma interrogativa

Forma simple	Forma con V-ing
could I substantiate? could you substantiate? could he substantiate? could we substantiate? could you substantiate? could they substantiate?	could I be substantiating? could you be substantiating? could he be substantiating? could we be substantiating? could you be substantiating? could they be substantiating?
Perfecto	Perfecto con V-ing
could I have substantiated? could you have substantiated? could he have substantiated? could we have substantiated? could you have substantiated? could they have substantiated?	could I have been substantiating? could you have been substantiating? could he have been substantiating? could we have been substantiating? could you have been substantiating? could they have been substantiating?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I substantiate? couldn't you substantiate? couldn't he substantiate? couldn't we substantiate? couldn't you substantiate? couldn't they substantiate?	couldn't I be substantiating? couldn't you be substantiating? couldn't he be substantiating? couldn't we be substantiating? couldn't you be substantiating? couldn't they be substantiating?
Perfecto	Perfecto con V-ing
couldn't I have substantiated? couldn't you have substantiated? couldn't he have substantiated? couldn't we have substantiated? couldn't you have substantiated? couldn't they have substantiated?	couldn't I have been substantiating? couldn't you have been substantiating? couldn't he have been substantiating? couldn't we have been substantiating? couldn't you have been substantiating? couldn't they have been substantiating?