English verb conjugation COULD DOUBT

Regular verb: doubt - doubted - doubted

Affirmation

Simple form

I could doubt
you could doubt
he could doubt
we could doubt
you could doubt
they could doubt

V-ing form

I could be doubting
you could be doubting
he could be doubting
we could be doubting
you could be doubting
they could be doubting

Perfect

I could have doubted
you could have doubted
he could have doubted
we could have doubted
you could have doubted
they could have doubted

V-ing perfect

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

Negation

Simple form

I couldn't doubt
you couldn't doubt
he couldn't doubt
we couldn't doubt
you couldn't doubt
they couldn't doubt

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I doubt?
could you doubt?
could he doubt?
could we doubt?
could you doubt?
could they doubt?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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