Regular verb: tighten - tightened - tightened
Simple form | V-ing form |
I could tighten you could tighten she could tighten we could tighten you could tighten they could tighten | I could be tightening you could be tightening she could be tightening we could be tightening you could be tightening they could be tightening |
Perfect | V-ing perfect |
I could have tightened you could have tightened she could have tightened we could have tightened you could have tightened they could have tightened | I could have been tightening you could have been tightening she could have been tightening we could have been tightening you could have been tightening they could have been tightening |
Simple form | V-ing form |
I couldn't tighten you couldn't tighten she couldn't tighten we couldn't tighten you couldn't tighten they couldn't tighten | I couldn't be tightening you couldn't be tightening she couldn't be tightening we couldn't be tightening you couldn't be tightening they couldn't be tightening |
Perfect | V-ing perfect |
I couldn't have tightened you couldn't have tightened she couldn't have tightened we couldn't have tightened you couldn't have tightened they couldn't have tightened | I couldn't have been tightening you couldn't have been tightening she couldn't have been tightening we couldn't have been tightening you couldn't have been tightening they couldn't have been tightening |
Simple form | V-ing form |
could I tighten? could you tighten? could she tighten? could we tighten? could you tighten? could they tighten? | could I be tightening? could you be tightening? could she be tightening? could we be tightening? could you be tightening? could they be tightening? |
Perfect | V-ing perfect |
could I have tightened? could you have tightened? could she have tightened? could we have tightened? could you have tightened? could they have tightened? | could I have been tightening? could you have been tightening? could she have been tightening? could we have been tightening? could you have been tightening? could they have been tightening? |
Simple form | V-ing form |
couldn't I tighten? couldn't you tighten? couldn't she tighten? couldn't we tighten? couldn't you tighten? couldn't they tighten? | couldn't I be tightening? couldn't you be tightening? couldn't she be tightening? couldn't we be tightening? couldn't you be tightening? couldn't they be tightening? |
Perfect | V-ing perfect |
couldn't I have tightened? couldn't you have tightened? couldn't she have tightened? couldn't we have tightened? couldn't you have tightened? couldn't they have tightened? | couldn't I have been tightening? couldn't you have been tightening? couldn't she have been tightening? couldn't we have been tightening? couldn't you have been tightening? couldn't they have been tightening? |