Regular verb: sharpen - sharpened - sharpened
Simple form | V-ing form |
I could sharpen you could sharpen he could sharpen we could sharpen you could sharpen they could sharpen | I could be sharpening you could be sharpening he could be sharpening we could be sharpening you could be sharpening they could be sharpening |
Perfect | V-ing perfect |
I could have sharpened you could have sharpened he could have sharpened we could have sharpened you could have sharpened they could have sharpened | I could have been sharpening you could have been sharpening he could have been sharpening we could have been sharpening you could have been sharpening they could have been sharpening |
Simple form | V-ing form |
I couldn't sharpen you couldn't sharpen he couldn't sharpen we couldn't sharpen you couldn't sharpen they couldn't sharpen | I couldn't be sharpening you couldn't be sharpening he couldn't be sharpening we couldn't be sharpening you couldn't be sharpening they couldn't be sharpening |
Perfect | V-ing perfect |
I couldn't have sharpened you couldn't have sharpened he couldn't have sharpened we couldn't have sharpened you couldn't have sharpened they couldn't have sharpened | I couldn't have been sharpening you couldn't have been sharpening he couldn't have been sharpening we couldn't have been sharpening you couldn't have been sharpening they couldn't have been sharpening |
Simple form | V-ing form |
could I sharpen? could you sharpen? could he sharpen? could we sharpen? could you sharpen? could they sharpen? | could I be sharpening? could you be sharpening? could he be sharpening? could we be sharpening? could you be sharpening? could they be sharpening? |
Perfect | V-ing perfect |
could I have sharpened? could you have sharpened? could he have sharpened? could we have sharpened? could you have sharpened? could they have sharpened? | could I have been sharpening? could you have been sharpening? could he have been sharpening? could we have been sharpening? could you have been sharpening? could they have been sharpening? |
Simple form | V-ing form |
couldn't I sharpen? couldn't you sharpen? couldn't he sharpen? couldn't we sharpen? couldn't you sharpen? couldn't they sharpen? | couldn't I be sharpening? couldn't you be sharpening? couldn't he be sharpening? couldn't we be sharpening? couldn't you be sharpening? couldn't they be sharpening? |
Perfect | V-ing perfect |
couldn't I have sharpened? couldn't you have sharpened? couldn't he have sharpened? couldn't we have sharpened? couldn't you have sharpened? couldn't they have sharpened? | couldn't I have been sharpening? couldn't you have been sharpening? couldn't he have been sharpening? couldn't we have been sharpening? couldn't you have been sharpening? couldn't they have been sharpening? |