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 cannot leaven you cannot leaven he cannot leaven we cannot leaven you cannot leaven they cannot leaven	I cannot be leavening you cannot be leavening he cannot be leavening we cannot be leavening you cannot be leavening they cannot be leavening
Perfect	V-ing perfect
I cannot have leavened you cannot have leavened he cannot have leavened we cannot have leavened you cannot have leavened they cannot have leavened	I cannot have been leavening you cannot have been leavening he cannot have been leavening we cannot have been leavening you cannot have been leavening they cannot 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 I not leaven? can you not leaven? can he not leaven? can we not leaven? can you not leaven? can they not leaven?	can I not be leavening? can you not be leavening? can he not be leavening? can we not be leavening? can you not be leavening? can they not be leavening?
Perfect	V-ing perfect
can I not have leavened? can you not have leavened? can he not have leavened? can we not have leavened? can you not have leavened? can they not have leavened?	can I not have been leavening? can you not have been leavening? can he not have been leavening? can we not have been leavening? can you not have been leavening? can they not have been leavening?