English verb conjugation
COULD REV

Regular verb: rev - reved - reved

Affirmation

Simple form	V-ing form
I could rev you could rev she could rev we could rev you could rev they could rev	I could be reving you could be reving she could be reving we could be reving you could be reving they could be reving
Perfect	V-ing perfect
I could have reved you could have reved she could have reved we could have reved you could have reved they could have reved	I could have been reving you could have been reving she could have been reving we could have been reving you could have been reving they could have been reving

Negation

Simple form	V-ing form
I couldn't rev you couldn't rev she couldn't rev we couldn't rev you couldn't rev they couldn't rev	I couldn't be reving you couldn't be reving she couldn't be reving we couldn't be reving you couldn't be reving they couldn't be reving
Perfect	V-ing perfect
I couldn't have reved you couldn't have reved she couldn't have reved we couldn't have reved you couldn't have reved they couldn't have reved	I couldn't have been reving you couldn't have been reving she couldn't have been reving we couldn't have been reving you couldn't have been reving they couldn't have been reving

Interrogative form

Simple form	V-ing form
could I rev? could you rev? could she rev? could we rev? could you rev? could they rev?	could I be reving? could you be reving? could she be reving? could we be reving? could you be reving? could they be reving?
Perfect	V-ing perfect
could I have reved? could you have reved? could she have reved? could we have reved? could you have reved? could they have reved?	could I have been reving? could you have been reving? could she have been reving? could we have been reving? could you have been reving? could they have been reving?

Interro-negative form

Simple form	V-ing form
couldn't I rev? couldn't you rev? couldn't she rev? couldn't we rev? couldn't you rev? couldn't they rev?	couldn't I be reving? couldn't you be reving? couldn't she be reving? couldn't we be reving? couldn't you be reving? couldn't they be reving?
Perfect	V-ing perfect
couldn't I have reved? couldn't you have reved? couldn't she have reved? couldn't we have reved? couldn't you have reved? couldn't they have reved?	couldn't I have been reving? couldn't you have been reving? couldn't she have been reving? couldn't we have been reving? couldn't you have been reving? couldn't they have been reving?