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