English verb conjugation
COULD OBSOLESCE

Regular verb: obsolesce - obsolesced - obsolesced

Affirmation

Simple form	V-ing form
I could obsolesce you could obsolesce he could obsolesce we could obsolesce you could obsolesce they could obsolesce	I could be obsolescing you could be obsolescing he could be obsolescing we could be obsolescing you could be obsolescing they could be obsolescing
Perfect	V-ing perfect
I could have obsolesced you could have obsolesced he could have obsolesced we could have obsolesced you could have obsolesced they could have obsolesced	I could have been obsolescing you could have been obsolescing he could have been obsolescing we could have been obsolescing you could have been obsolescing they could have been obsolescing

Negation

Simple form	V-ing form
I couldn't obsolesce you couldn't obsolesce he couldn't obsolesce we couldn't obsolesce you couldn't obsolesce they couldn't obsolesce	I couldn't be obsolescing you couldn't be obsolescing he couldn't be obsolescing we couldn't be obsolescing you couldn't be obsolescing they couldn't be obsolescing
Perfect	V-ing perfect
I couldn't have obsolesced you couldn't have obsolesced he couldn't have obsolesced we couldn't have obsolesced you couldn't have obsolesced they couldn't have obsolesced	I couldn't have been obsolescing you couldn't have been obsolescing he couldn't have been obsolescing we couldn't have been obsolescing you couldn't have been obsolescing they couldn't have been obsolescing

Interrogative form

Simple form	V-ing form
could I obsolesce? could you obsolesce? could he obsolesce? could we obsolesce? could you obsolesce? could they obsolesce?	could I be obsolescing? could you be obsolescing? could he be obsolescing? could we be obsolescing? could you be obsolescing? could they be obsolescing?
Perfect	V-ing perfect
could I have obsolesced? could you have obsolesced? could he have obsolesced? could we have obsolesced? could you have obsolesced? could they have obsolesced?	could I have been obsolescing? could you have been obsolescing? could he have been obsolescing? could we have been obsolescing? could you have been obsolescing? could they have been obsolescing?

Interro-negative form

Simple form	V-ing form
couldn't I obsolesce? couldn't you obsolesce? couldn't he obsolesce? couldn't we obsolesce? couldn't you obsolesce? couldn't they obsolesce?	couldn't I be obsolescing? couldn't you be obsolescing? couldn't he be obsolescing? couldn't we be obsolescing? couldn't you be obsolescing? couldn't they be obsolescing?
Perfect	V-ing perfect
couldn't I have obsolesced? couldn't you have obsolesced? couldn't he have obsolesced? couldn't we have obsolesced? couldn't you have obsolesced? couldn't they have obsolesced?	couldn't I have been obsolescing? couldn't you have been obsolescing? couldn't he have been obsolescing? couldn't we have been obsolescing? couldn't you have been obsolescing? couldn't they have been obsolescing?