English verb conjugation COULD FAIL

Regular verb: fail - failed - failed


Affirmation

Simple form

I could fail
you could fail
he could fail
we could fail
you could fail
they could fail

V-ing form

I could be failing
you could be failing
he could be failing
we could be failing
you could be failing
they could be failing

Perfect

I could have failed
you could have failed
he could have failed
we could have failed
you could have failed
they could have failed

V-ing perfect

I could have been failing
you could have been failing
he could have been failing
we could have been failing
you could have been failing
they could have been failing

Negation

Simple form

I could not fail
you could not fail
he could not fail
we could not fail
you could not fail
they could not fail

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I fail?
could you fail?
could he fail?
could we fail?
could you fail?
could they fail?

V-ing form

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

Perfect

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

V-ing perfect

could I have been failing?
could you have been failing?
could he have been failing?
could we have been failing?
could you have been failing?
could they have been failing?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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