I could revive you could revive he could revive we could revive you could revive they could revive
V-ing form
I could be reviving you could be reviving he could be reviving we could be reviving you could be reviving they could be reviving
Perfect
I could have revived you could have revived he could have revived we could have revived you could have revived they could have revived
V-ing perfect
I could have been reviving you could have been reviving he could have been reviving we could have been reviving you could have been reviving they could have been reviving
Negation
Simple form
I couldn't revive you couldn't revive he couldn't revive we couldn't revive you couldn't revive they couldn't revive
V-ing form
I couldn't be reviving you couldn't be reviving he couldn't be reviving we couldn't be reviving you couldn't be reviving they couldn't be reviving
Perfect
I couldn't have revived you couldn't have revived he couldn't have revived we couldn't have revived you couldn't have revived they couldn't have revived
V-ing perfect
I couldn't have been reviving you couldn't have been reviving he couldn't have been reviving we couldn't have been reviving you couldn't have been reviving they couldn't have been reviving
Interrogative form
Simple form
could I revive? could you revive? could he revive? could we revive? could you revive? could they revive?
V-ing form
could I be reviving? could you be reviving? could he be reviving? could we be reviving? could you be reviving? could they be reviving?
Perfect
could I have revived? could you have revived? could he have revived? could we have revived? could you have revived? could they have revived?
V-ing perfect
could I have been reviving? could you have been reviving? could he have been reviving? could we have been reviving? could you have been reviving? could they have been reviving?
Interro-negative form
Simple form
couldn't I revive? couldn't you revive? couldn't he revive? couldn't we revive? couldn't you revive? couldn't they revive?
V-ing form
couldn't I be reviving? couldn't you be reviving? couldn't he be reviving? couldn't we be reviving? couldn't you be reviving? couldn't they be reviving?
Perfect
couldn't I have revived? couldn't you have revived? couldn't he have revived? couldn't we have revived? couldn't you have revived? couldn't they have revived?
V-ing perfect
couldn't I have been reviving? couldn't you have been reviving? couldn't he have been reviving? couldn't we have been reviving? couldn't you have been reviving? couldn't they have been reviving?