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