female gender | Modal : no | may | might | can | could | shall | should | will | would | must | ought to
English verb conjugation COULD FAIL
Regular verb: fail - failed - failed
Affirmation
Simple form
I could failyou could fail
he could fail
we could fail
you could fail
they could fail
V-ing form
I could be failingyou could be failing
he could be failing
we could be failing
you could be failing
they could be failing
Perfect
I could have failedyou 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 failingyou 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 failyou 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 failingyou 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 failedyou 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 failingyou 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?