could varnish
Regular verb: varnish - varnished- varnished

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?