English verb conjugation
CAN LEAVEN

Regular verb: leaven - leavened - leavened

Affirmation

Simple form	V-ing form
I can leaven you can leaven he can leaven we can leaven you can leaven they can leaven	I can be leavening you can be leavening he can be leavening we can be leavening you can be leavening they can be leavening
Perfect	V-ing perfect
I can have leavened you can have leavened he can have leavened we can have leavened you can have leavened they can have leavened	I can have been leavening you can have been leavening he can have been leavening we can have been leavening you can have been leavening they can have been leavening

Negation

Simple form	V-ing form
I can't leaven you can't leaven he can't leaven we can't leaven you can't leaven they can't leaven	I can't be leavening you can't be leavening he can't be leavening we can't be leavening you can't be leavening they can't be leavening
Perfect	V-ing perfect
I can't have leavened you can't have leavened he can't have leavened we can't have leavened you can't have leavened they can't have leavened	I can't have been leavening you can't have been leavening he can't have been leavening we can't have been leavening you can't have been leavening they can't have been leavening

Interrogative form

Simple form	V-ing form
can I leaven? can you leaven? can he leaven? can we leaven? can you leaven? can they leaven?	can I be leavening? can you be leavening? can he be leavening? can we be leavening? can you be leavening? can they be leavening?
Perfect	V-ing perfect
can I have leavened? can you have leavened? can he have leavened? can we have leavened? can you have leavened? can they have leavened?	can I have been leavening? can you have been leavening? can he have been leavening? can we have been leavening? can you have been leavening? can they have been leavening?

Interro-negative form

Simple form	V-ing form
can't I leaven? can't you leaven? can't he leaven? can't we leaven? can't you leaven? can't they leaven?	can't I be leavening? can't you be leavening? can't he be leavening? can't we be leavening? can't you be leavening? can't they be leavening?
Perfect	V-ing perfect
can't I have leavened? can't you have leavened? can't he have leavened? can't we have leavened? can't you have leavened? can't they have leavened?	can't I have been leavening? can't you have been leavening? can't he have been leavening? can't we have been leavening? can't you have been leavening? can't they have been leavening?