English verb conjugation COULD LEAVEN

Regular verb: leaven - leavened - leavened

Affirmation

Simple form

I could leaven
you could leaven
he could leaven
we could leaven
you could leaven
they could leaven

V-ing form

I could be leavening
you could be leavening
he could be leavening
we could be leavening
you could be leavening
they could be leavening

Perfect

I could have leavened
you could have leavened
he could have leavened
we could have leavened
you could have leavened
they could have leavened

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I leaven?
could you leaven?
could he leaven?
could we leaven?
could you leaven?
could they leaven?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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