English verb conjugation
CAN WHITEN

Regular verb: whiten - whitened - whitened

Affirmation

Simple form	V-ing form
I can whiten you can whiten he can whiten we can whiten you can whiten they can whiten	I can be whitening you can be whitening he can be whitening we can be whitening you can be whitening they can be whitening
Perfect	V-ing perfect
I can have whitened you can have whitened he can have whitened we can have whitened you can have whitened they can have whitened	I can have been whitening you can have been whitening he can have been whitening we can have been whitening you can have been whitening they can have been whitening

Negation

Simple form	V-ing form
I can't whiten you can't whiten he can't whiten we can't whiten you can't whiten they can't whiten	I can't be whitening you can't be whitening he can't be whitening we can't be whitening you can't be whitening they can't be whitening
Perfect	V-ing perfect
I can't have whitened you can't have whitened he can't have whitened we can't have whitened you can't have whitened they can't have whitened	I can't have been whitening you can't have been whitening he can't have been whitening we can't have been whitening you can't have been whitening they can't have been whitening

Interrogative form

Simple form	V-ing form
can I whiten? can you whiten? can he whiten? can we whiten? can you whiten? can they whiten?	can I be whitening? can you be whitening? can he be whitening? can we be whitening? can you be whitening? can they be whitening?
Perfect	V-ing perfect
can I have whitened? can you have whitened? can he have whitened? can we have whitened? can you have whitened? can they have whitened?	can I have been whitening? can you have been whitening? can he have been whitening? can we have been whitening? can you have been whitening? can they have been whitening?

Interro-negative form

Simple form	V-ing form
can't I whiten? can't you whiten? can't he whiten? can't we whiten? can't you whiten? can't they whiten?	can't I be whitening? can't you be whitening? can't he be whitening? can't we be whitening? can't you be whitening? can't they be whitening?
Perfect	V-ing perfect
can't I have whitened? can't you have whitened? can't he have whitened? can't we have whitened? can't you have whitened? can't they have whitened?	can't I have been whitening? can't you have been whitening? can't he have been whitening? can't we have been whitening? can't you have been whitening? can't they have been whitening?