Regular verb: stiffen - stiffened - stiffened
Simple form | V-ing form |
I can stiffen you can stiffen he can stiffen we can stiffen you can stiffen they can stiffen | I can be stiffening you can be stiffening he can be stiffening we can be stiffening you can be stiffening they can be stiffening |
Perfect | V-ing perfect |
I can have stiffened you can have stiffened he can have stiffened we can have stiffened you can have stiffened they can have stiffened | I can have been stiffening you can have been stiffening he can have been stiffening we can have been stiffening you can have been stiffening they can have been stiffening |
Simple form | V-ing form |
I can't stiffen you can't stiffen he can't stiffen we can't stiffen you can't stiffen they can't stiffen | I can't be stiffening you can't be stiffening he can't be stiffening we can't be stiffening you can't be stiffening they can't be stiffening |
Perfect | V-ing perfect |
I can't have stiffened you can't have stiffened he can't have stiffened we can't have stiffened you can't have stiffened they can't have stiffened | I can't have been stiffening you can't have been stiffening he can't have been stiffening we can't have been stiffening you can't have been stiffening they can't have been stiffening |
Simple form | V-ing form |
can I stiffen? can you stiffen? can he stiffen? can we stiffen? can you stiffen? can they stiffen? | can I be stiffening? can you be stiffening? can he be stiffening? can we be stiffening? can you be stiffening? can they be stiffening? |
Perfect | V-ing perfect |
can I have stiffened? can you have stiffened? can he have stiffened? can we have stiffened? can you have stiffened? can they have stiffened? | can I have been stiffening? can you have been stiffening? can he have been stiffening? can we have been stiffening? can you have been stiffening? can they have been stiffening? |
Simple form | V-ing form |
can't I stiffen? can't you stiffen? can't he stiffen? can't we stiffen? can't you stiffen? can't they stiffen? | can't I be stiffening? can't you be stiffening? can't he be stiffening? can't we be stiffening? can't you be stiffening? can't they be stiffening? |
Perfect | V-ing perfect |
can't I have stiffened? can't you have stiffened? can't he have stiffened? can't we have stiffened? can't you have stiffened? can't they have stiffened? | can't I have been stiffening? can't you have been stiffening? can't he have been stiffening? can't we have been stiffening? can't you have been stiffening? can't they have been stiffening? |