English verb conjugation COULD CHALLENGE

Regular verb: challenge - challenged - challenged

Affirmation

Simple form

I could challenge
you could challenge
he could challenge
we could challenge
you could challenge
they could challenge

V-ing form

I could be challenging
you could be challenging
he could be challenging
we could be challenging
you could be challenging
they could be challenging

Perfect

I could have challenged
you could have challenged
he could have challenged
we could have challenged
you could have challenged
they could have challenged

V-ing perfect

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

Negation

Simple form

I could not challenge
you could not challenge
he could not challenge
we could not challenge
you could not challenge
they could not challenge

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I challenge?
could you challenge?
could he challenge?
could we challenge?
could you challenge?
could they challenge?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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