English verb conjugation
CAN THICKEN

Regular verb: thicken - thickened - thickened

Affirmation

Simple form	V-ing form
I can thicken you can thicken he can thicken we can thicken you can thicken they can thicken	I can be thickening you can be thickening he can be thickening we can be thickening you can be thickening they can be thickening
Perfect	V-ing perfect
I can have thickened you can have thickened he can have thickened we can have thickened you can have thickened they can have thickened	I can have been thickening you can have been thickening he can have been thickening we can have been thickening you can have been thickening they can have been thickening

Negation

Simple form	V-ing form
I can't thicken you can't thicken he can't thicken we can't thicken you can't thicken they can't thicken	I can't be thickening you can't be thickening he can't be thickening we can't be thickening you can't be thickening they can't be thickening
Perfect	V-ing perfect
I can't have thickened you can't have thickened he can't have thickened we can't have thickened you can't have thickened they can't have thickened	I can't have been thickening you can't have been thickening he can't have been thickening we can't have been thickening you can't have been thickening they can't have been thickening

Interrogative form

Simple form	V-ing form
can I thicken? can you thicken? can he thicken? can we thicken? can you thicken? can they thicken?	can I be thickening? can you be thickening? can he be thickening? can we be thickening? can you be thickening? can they be thickening?
Perfect	V-ing perfect
can I have thickened? can you have thickened? can he have thickened? can we have thickened? can you have thickened? can they have thickened?	can I have been thickening? can you have been thickening? can he have been thickening? can we have been thickening? can you have been thickening? can they have been thickening?

Interro-negative form

Simple form	V-ing form
can't I thicken? can't you thicken? can't he thicken? can't we thicken? can't you thicken? can't they thicken?	can't I be thickening? can't you be thickening? can't he be thickening? can't we be thickening? can't you be thickening? can't they be thickening?
Perfect	V-ing perfect
can't I have thickened? can't you have thickened? can't he have thickened? can't we have thickened? can't you have thickened? can't they have thickened?	can't I have been thickening? can't you have been thickening? can't he have been thickening? can't we have been thickening? can't you have been thickening? can't they have been thickening?