Conjugación del verbo inglés
CAN REFER

Verbo regular: refer - referred - referred

Afirmación

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

Negación

Forma simple	Forma con V-ing
I can't refer you can't refer he can't refer we can't refer you can't refer they can't refer	I can't be referring you can't be referring he can't be referring we can't be referring you can't be referring they can't be referring
Perfecto	Perfecto con V-ing
I can't have referred you can't have referred he can't have referred we can't have referred you can't have referred they can't have referred	I can't have been referring you can't have been referring he can't have been referring we can't have been referring you can't have been referring they can't have been referring

Forma interrogativa

Forma simple	Forma con V-ing
can I refer? can you refer? can he refer? can we refer? can you refer? can they refer?	can I be referring? can you be referring? can he be referring? can we be referring? can you be referring? can they be referring?
Perfecto	Perfecto con V-ing
can I have referred? can you have referred? can he have referred? can we have referred? can you have referred? can they have referred?	can I have been referring? can you have been referring? can he have been referring? can we have been referring? can you have been referring? can they have been referring?

Forma interro-negativa

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