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 couldn't challenge
you couldn't challenge
he couldn't challenge
we couldn't challenge
you couldn't challenge
they couldn't challenge

V-ing form

I couldn't be challenging
you couldn't be challenging
he couldn't be challenging
we couldn't be challenging
you couldn't be challenging
they couldn't be challenging

Perfect

I couldn't have challenged
you couldn't have challenged
he couldn't have challenged
we couldn't have challenged
you couldn't have challenged
they couldn't have challenged

V-ing perfect

I couldn't have been challenging
you couldn't have been challenging
he couldn't have been challenging
we couldn't have been challenging
you couldn't have been challenging
they couldn't 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

couldn't I challenge?
couldn't you challenge?
couldn't he challenge?
couldn't we challenge?
couldn't you challenge?
couldn't they challenge?

V-ing form

couldn't I be challenging?
couldn't you be challenging?
couldn't he be challenging?
couldn't we be challenging?
couldn't you be challenging?
couldn't they be challenging?

Perfect

couldn't I have challenged?
couldn't you have challenged?
couldn't he have challenged?
couldn't we have challenged?
couldn't you have challenged?
couldn't they have challenged?

V-ing perfect

couldn't I have been challenging?
couldn't you have been challenging?
couldn't he have been challenging?
couldn't we have been challenging?
couldn't you have been challenging?
couldn't they have been challenging?

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