I could refer you could refer he could refer we could refer you could refer they could refer
Forma com V-ing
I could be referring you could be referring he could be referring we could be referring you could be referring they could be referring
Perfeito
I could have referred you could have referred he could have referred we could have referred you could have referred they could have referred
Perfeito com V-ing
I could have been referring you could have been referring he could have been referring we could have been referring you could have been referring they could have been referring
Negação
Forma simple
I couldn't refer you couldn't refer he couldn't refer we couldn't refer you couldn't refer they couldn't refer
Forma com V-ing
I couldn't be referring you couldn't be referring he couldn't be referring we couldn't be referring you couldn't be referring they couldn't be referring
Perfeito
I couldn't have referred you couldn't have referred he couldn't have referred we couldn't have referred you couldn't have referred they couldn't have referred
Perfeito com V-ing
I couldn't have been referring you couldn't have been referring he couldn't have been referring we couldn't have been referring you couldn't have been referring they couldn't have been referring
Forma interrogativa
Forma simple
could I refer? could you refer? could he refer? could we refer? could you refer? could they refer?
Forma com V-ing
could I be referring? could you be referring? could he be referring? could we be referring? could you be referring? could they be referring?
Perfeito
could I have referred? could you have referred? could he have referred? could we have referred? could you have referred? could they have referred?
Perfeito com V-ing
could I have been referring? could you have been referring? could he have been referring? could we have been referring? could you have been referring? could they have been referring?
Forma interro-Negação
Forma simple
couldn't I refer? couldn't you refer? couldn't he refer? couldn't we refer? couldn't you refer? couldn't they refer?
Forma com V-ing
couldn't I be referring? couldn't you be referring? couldn't he be referring? couldn't we be referring? couldn't you be referring? couldn't they be referring?
Perfeito
couldn't I have referred? couldn't you have referred? couldn't he have referred? couldn't we have referred? couldn't you have referred? couldn't they have referred?
Perfeito com V-ing
couldn't I have been referring? couldn't you have been referring? couldn't he have been referring? couldn't we have been referring? couldn't you have been referring? couldn't they have been referring?