English verb conjugation COULD REFER

Regular verb: refer - referred - referred

Affirmation

Simple form

I could refer
you could refer
he could refer
we could refer
you could refer
they could refer

V-ing form

I could be referring
you could be referring
he could be referring
we could be referring
you could be referring
they could be referring

Perfect

I could have referred
you could have referred
he could have referred
we could have referred
you could have referred
they could have referred

V-ing perfect

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

Negation

Simple form

I could not refer
you could not refer
he could not refer
we could not refer
you could not refer
they could not refer

V-ing form

I could not be referring
you could not be referring
he could not be referring
we could not be referring
you could not be referring
they could not be referring

Perfect

I could not have referred
you could not have referred
he could not have referred
we could not have referred
you could not have referred
they could not have referred

V-ing perfect

I could not have been referring
you could not have been referring
he could not have been referring
we could not have been referring
you could not have been referring
they could not have been referring

Interrogative form

Simple form

could I refer?
could you refer?
could he refer?
could we refer?
could you refer?
could they refer?

V-ing form

could I be referring?
could you be referring?
could he be referring?
could we be referring?
could you be referring?
could they be referring?

Perfect

could I have referred?
could you have referred?
could he have referred?
could we have referred?
could you have referred?
could they have referred?

V-ing perfect

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?

Interro-negative form

Simple form

could I not refer?
could you not refer?
could he not refer?
could we not refer?
could you not refer?
could they not refer?

V-ing form

could I not be referring?
could you not be referring?
could he not be referring?
could we not be referring?
could you not be referring?
could they not be referring?

Perfect

could I not have referred?
could you not have referred?
could he not have referred?
could we not have referred?
could you not have referred?
could they not have referred?

V-ing perfect

could I not have been referring?
could you not have been referring?
could he not have been referring?
could we not have been referring?
could you not have been referring?
could they not have been referring?

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