Regular verb: darken - darkened - darkened
Simple form | V-ing form |
I must darken you must darken he must darken we must darken you must darken they must darken | I must be darkening you must be darkening he must be darkening we must be darkening you must be darkening they must be darkening |
Perfect | V-ing perfect |
I must have darkened you must have darkened he must have darkened we must have darkened you must have darkened they must have darkened | I must have been darkening you must have been darkening he must have been darkening we must have been darkening you must have been darkening they must have been darkening |
Simple form | V-ing form |
I must not darken you must not darken he must not darken we must not darken you must not darken they must not darken | I must not be darkening you must not be darkening he must not be darkening we must not be darkening you must not be darkening they must not be darkening |
Perfect | V-ing perfect |
I must not have darkened you must not have darkened he must not have darkened we must not have darkened you must not have darkened they must not have darkened | I must not have been darkening you must not have been darkening he must not have been darkening we must not have been darkening you must not have been darkening they must not have been darkening |
Simple form | V-ing form |
must I darken? must you darken? must he darken? must we darken? must you darken? must they darken? | must I be darkening? must you be darkening? must he be darkening? must we be darkening? must you be darkening? must they be darkening? |
Perfect | V-ing perfect |
must I have darkened? must you have darkened? must he have darkened? must we have darkened? must you have darkened? must they have darkened? | must I have been darkening? must you have been darkening? must he have been darkening? must we have been darkening? must you have been darkening? must they have been darkening? |
Simple form | V-ing form |
must I not darken? must you not darken? must he not darken? must we not darken? must you not darken? must they not darken? | must I not be darkening? must you not be darkening? must he not be darkening? must we not be darkening? must you not be darkening? must they not be darkening? |
Perfect | V-ing perfect |
must I not have darkened? must you not have darkened? must he not have darkened? must we not have darkened? must you not have darkened? must they not have darkened? | must I not have been darkening? must you not have been darkening? must he not have been darkening? must we not have been darkening? must you not have been darkening? must they not have been darkening? |