English verb conjugation
COULD TAR

Regular verb: tar - tarred - tarred

Affirmation

Simple form	V-ing form
I could tar you could tar she could tar we could tar you could tar they could tar	I could be tarring you could be tarring she could be tarring we could be tarring you could be tarring they could be tarring
Perfect	V-ing perfect
I could have tarred you could have tarred she could have tarred we could have tarred you could have tarred they could have tarred	I could have been tarring you could have been tarring she could have been tarring we could have been tarring you could have been tarring they could have been tarring

Negation

Simple form	V-ing form
I couldn't tar you couldn't tar she couldn't tar we couldn't tar you couldn't tar they couldn't tar	I couldn't be tarring you couldn't be tarring she couldn't be tarring we couldn't be tarring you couldn't be tarring they couldn't be tarring
Perfect	V-ing perfect
I couldn't have tarred you couldn't have tarred she couldn't have tarred we couldn't have tarred you couldn't have tarred they couldn't have tarred	I couldn't have been tarring you couldn't have been tarring she couldn't have been tarring we couldn't have been tarring you couldn't have been tarring they couldn't have been tarring

Interrogative form

Simple form	V-ing form
could I tar? could you tar? could she tar? could we tar? could you tar? could they tar?	could I be tarring? could you be tarring? could she be tarring? could we be tarring? could you be tarring? could they be tarring?
Perfect	V-ing perfect
could I have tarred? could you have tarred? could she have tarred? could we have tarred? could you have tarred? could they have tarred?	could I have been tarring? could you have been tarring? could she have been tarring? could we have been tarring? could you have been tarring? could they have been tarring?

Interro-negative form

Simple form	V-ing form
couldn't I tar? couldn't you tar? couldn't she tar? couldn't we tar? couldn't you tar? couldn't they tar?	couldn't I be tarring? couldn't you be tarring? couldn't she be tarring? couldn't we be tarring? couldn't you be tarring? couldn't they be tarring?
Perfect	V-ing perfect
couldn't I have tarred? couldn't you have tarred? couldn't she have tarred? couldn't we have tarred? couldn't you have tarred? couldn't they have tarred?	couldn't I have been tarring? couldn't you have been tarring? couldn't she have been tarring? couldn't we have been tarring? couldn't you have been tarring? couldn't they have been tarring?