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