English verb conjugation
COULD VARNISH

Regular verb: varnish - varnished - varnished

Affirmation

Simple form	V-ing form
I could varnish you could varnish he could varnish we could varnish you could varnish they could varnish	I could be varnishing you could be varnishing he could be varnishing we could be varnishing you could be varnishing they could be varnishing
Perfect	V-ing perfect
I could have varnished you could have varnished he could have varnished we could have varnished you could have varnished they could have varnished	I could have been varnishing you could have been varnishing he could have been varnishing we could have been varnishing you could have been varnishing they could have been varnishing

Negation

Simple form	V-ing form
I couldn't varnish you couldn't varnish he couldn't varnish we couldn't varnish you couldn't varnish they couldn't varnish	I couldn't be varnishing you couldn't be varnishing he couldn't be varnishing we couldn't be varnishing you couldn't be varnishing they couldn't be varnishing
Perfect	V-ing perfect
I couldn't have varnished you couldn't have varnished he couldn't have varnished we couldn't have varnished you couldn't have varnished they couldn't have varnished	I couldn't have been varnishing you couldn't have been varnishing he couldn't have been varnishing we couldn't have been varnishing you couldn't have been varnishing they couldn't have been varnishing

Interrogative form

Simple form	V-ing form
could I varnish? could you varnish? could he varnish? could we varnish? could you varnish? could they varnish?	could I be varnishing? could you be varnishing? could he be varnishing? could we be varnishing? could you be varnishing? could they be varnishing?
Perfect	V-ing perfect
could I have varnished? could you have varnished? could he have varnished? could we have varnished? could you have varnished? could they have varnished?	could I have been varnishing? could you have been varnishing? could he have been varnishing? could we have been varnishing? could you have been varnishing? could they have been varnishing?

Interro-negative form

Simple form	V-ing form
couldn't I varnish? couldn't you varnish? couldn't he varnish? couldn't we varnish? couldn't you varnish? couldn't they varnish?	couldn't I be varnishing? couldn't you be varnishing? couldn't he be varnishing? couldn't we be varnishing? couldn't you be varnishing? couldn't they be varnishing?
Perfect	V-ing perfect
couldn't I have varnished? couldn't you have varnished? couldn't he have varnished? couldn't we have varnished? couldn't you have varnished? couldn't they have varnished?	couldn't I have been varnishing? couldn't you have been varnishing? couldn't he have been varnishing? couldn't we have been varnishing? couldn't you have been varnishing? couldn't they have been varnishing?