Verbo regular: reference - referenced - referenced
Afirmação
Forma simple
I could reference you could reference he could reference we could reference you could reference they could reference
Forma com V-ing
I could be referencing you could be referencing he could be referencing we could be referencing you could be referencing they could be referencing
Perfeito
I could have referenced you could have referenced he could have referenced we could have referenced you could have referenced they could have referenced
Perfeito com V-ing
I could have been referencing you could have been referencing he could have been referencing we could have been referencing you could have been referencing they could have been referencing
Negação
Forma simple
I couldn't reference you couldn't reference he couldn't reference we couldn't reference you couldn't reference they couldn't reference
Forma com V-ing
I couldn't be referencing you couldn't be referencing he couldn't be referencing we couldn't be referencing you couldn't be referencing they couldn't be referencing
Perfeito
I couldn't have referenced you couldn't have referenced he couldn't have referenced we couldn't have referenced you couldn't have referenced they couldn't have referenced
Perfeito com V-ing
I couldn't have been referencing you couldn't have been referencing he couldn't have been referencing we couldn't have been referencing you couldn't have been referencing they couldn't have been referencing
Forma interrogativa
Forma simple
could I reference? could you reference? could he reference? could we reference? could you reference? could they reference?
Forma com V-ing
could I be referencing? could you be referencing? could he be referencing? could we be referencing? could you be referencing? could they be referencing?
Perfeito
could I have referenced? could you have referenced? could he have referenced? could we have referenced? could you have referenced? could they have referenced?
Perfeito com V-ing
could I have been referencing? could you have been referencing? could he have been referencing? could we have been referencing? could you have been referencing? could they have been referencing?
Forma interro-Negação
Forma simple
couldn't I reference? couldn't you reference? couldn't he reference? couldn't we reference? couldn't you reference? couldn't they reference?
Forma com V-ing
couldn't I be referencing? couldn't you be referencing? couldn't he be referencing? couldn't we be referencing? couldn't you be referencing? couldn't they be referencing?
Perfeito
couldn't I have referenced? couldn't you have referenced? couldn't he have referenced? couldn't we have referenced? couldn't you have referenced? couldn't they have referenced?
Perfeito com V-ing
couldn't I have been referencing? couldn't you have been referencing? couldn't he have been referencing? couldn't we have been referencing? couldn't you have been referencing? couldn't they have been referencing?