Conjugación del verbo inglés
COULD REFER

Verbo regular: refer - referred - referred

Afirmación

Forma simple	Forma con V-ing
I could refer you could refer she could refer we could refer you could refer they could refer	I could be referring you could be referring she could be referring we could be referring you could be referring they could be referring
Perfecto	Perfecto con V-ing
I could have referred you could have referred she could have referred we could have referred you could have referred they could have referred	I could have been referring you could have been referring she could have been referring we could have been referring you could have been referring they could have been referring

Negación

Forma simple	Forma con V-ing
I couldn't refer you couldn't refer she couldn't refer we couldn't refer you couldn't refer they couldn't refer	I couldn't be referring you couldn't be referring she couldn't be referring we couldn't be referring you couldn't be referring they couldn't be referring
Perfecto	Perfecto con V-ing
I couldn't have referred you couldn't have referred she couldn't have referred we couldn't have referred you couldn't have referred they couldn't have referred	I couldn't have been referring you couldn't have been referring she 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	Forma con V-ing
could I refer? could you refer? could she refer? could we refer? could you refer? could they refer?	could I be referring? could you be referring? could she be referring? could we be referring? could you be referring? could they be referring?
Perfecto	Perfecto con V-ing
could I have referred? could you have referred? could she have referred? could we have referred? could you have referred? could they have referred?	could I have been referring? could you have been referring? could she have been referring? could we have been referring? could you have been referring? could they have been referring?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I refer? couldn't you refer? couldn't she refer? couldn't we refer? couldn't you refer? couldn't they refer?	couldn't I be referring? couldn't you be referring? couldn't she be referring? couldn't we be referring? couldn't you be referring? couldn't they be referring?
Perfecto	Perfecto con V-ing
couldn't I have referred? couldn't you have referred? couldn't she have referred? couldn't we have referred? couldn't you have referred? couldn't they have referred?	couldn't I have been referring? couldn't you have been referring? couldn't she have been referring? couldn't we have been referring? couldn't you have been referring? couldn't they have been referring?