English verb conjugation
COULD OBSOLESCE

Regular verb: obsolesce - obsolesced - obsolesced

Affirmation

Simple form	V-ing form
I could obsolesce you could obsolesce she could obsolesce we could obsolesce you could obsolesce they could obsolesce	I could be obsolescing you could be obsolescing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she obsolesce? could we obsolesce? could you obsolesce? could they obsolesce?	could I be obsolescing? could you be obsolescing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been obsolescing? couldn't we have been obsolescing? couldn't you have been obsolescing? couldn't they have been obsolescing?