English verb conjugation
COULD REJOICE

Regular verb: rejoice - rejoiced - rejoiced

Affirmation

Simple form	V-ing form
I could rejoice you could rejoice she could rejoice we could rejoice you could rejoice they could rejoice	I could be rejoicing you could be rejoicing she could be rejoicing we could be rejoicing you could be rejoicing they could be rejoicing
Perfect	V-ing perfect
I could have rejoiced you could have rejoiced she could have rejoiced we could have rejoiced you could have rejoiced they could have rejoiced	I could have been rejoicing you could have been rejoicing she could have been rejoicing we could have been rejoicing you could have been rejoicing they could have been rejoicing

Negation

Simple form	V-ing form
I couldn't rejoice you couldn't rejoice she couldn't rejoice we couldn't rejoice you couldn't rejoice they couldn't rejoice	I couldn't be rejoicing you couldn't be rejoicing she couldn't be rejoicing we couldn't be rejoicing you couldn't be rejoicing they couldn't be rejoicing
Perfect	V-ing perfect
I couldn't have rejoiced you couldn't have rejoiced she couldn't have rejoiced we couldn't have rejoiced you couldn't have rejoiced they couldn't have rejoiced	I couldn't have been rejoicing you couldn't have been rejoicing she couldn't have been rejoicing we couldn't have been rejoicing you couldn't have been rejoicing they couldn't have been rejoicing

Interrogative form

Simple form	V-ing form
could I rejoice? could you rejoice? could she rejoice? could we rejoice? could you rejoice? could they rejoice?	could I be rejoicing? could you be rejoicing? could she be rejoicing? could we be rejoicing? could you be rejoicing? could they be rejoicing?
Perfect	V-ing perfect
could I have rejoiced? could you have rejoiced? could she have rejoiced? could we have rejoiced? could you have rejoiced? could they have rejoiced?	could I have been rejoicing? could you have been rejoicing? could she have been rejoicing? could we have been rejoicing? could you have been rejoicing? could they have been rejoicing?

Interro-negative form

Simple form	V-ing form
couldn't I rejoice? couldn't you rejoice? couldn't she rejoice? couldn't we rejoice? couldn't you rejoice? couldn't they rejoice?	couldn't I be rejoicing? couldn't you be rejoicing? couldn't she be rejoicing? couldn't we be rejoicing? couldn't you be rejoicing? couldn't they be rejoicing?
Perfect	V-ing perfect
couldn't I have rejoiced? couldn't you have rejoiced? couldn't she have rejoiced? couldn't we have rejoiced? couldn't you have rejoiced? couldn't they have rejoiced?	couldn't I have been rejoicing? couldn't you have been rejoicing? couldn't she have been rejoicing? couldn't we have been rejoicing? couldn't you have been rejoicing? couldn't they have been rejoicing?