I can varnish you can varnish he can varnish we can varnish you can varnish they can varnish
V-ing form
I can be varnishing you can be varnishing he can be varnishing we can be varnishing you can be varnishing they can be varnishing
Perfect
I can have varnished you can have varnished he can have varnished we can have varnished you can have varnished they can have varnished
V-ing perfect
I can have been varnishing you can have been varnishing he can have been varnishing we can have been varnishing you can have been varnishing they can have been varnishing
Negation
Simple form
I can't varnish you can't varnish he can't varnish we can't varnish you can't varnish they can't varnish
V-ing form
I can't be varnishing you can't be varnishing he can't be varnishing we can't be varnishing you can't be varnishing they can't be varnishing
Perfect
I can't have varnished you can't have varnished he can't have varnished we can't have varnished you can't have varnished they can't have varnished
V-ing perfect
I can't have been varnishing you can't have been varnishing he can't have been varnishing we can't have been varnishing you can't have been varnishing they can't have been varnishing
Interrogative form
Simple form
can I varnish? can you varnish? can he varnish? can we varnish? can you varnish? can they varnish?
V-ing form
can I be varnishing? can you be varnishing? can he be varnishing? can we be varnishing? can you be varnishing? can they be varnishing?
Perfect
can I have varnished? can you have varnished? can he have varnished? can we have varnished? can you have varnished? can they have varnished?
V-ing perfect
can I have been varnishing? can you have been varnishing? can he have been varnishing? can we have been varnishing? can you have been varnishing? can they have been varnishing?
Interro-negative form
Simple form
can't I varnish? can't you varnish? can't he varnish? can't we varnish? can't you varnish? can't they varnish?
V-ing form
can't I be varnishing? can't you be varnishing? can't he be varnishing? can't we be varnishing? can't you be varnishing? can't they be varnishing?
Perfect
can't I have varnished? can't you have varnished? can't he have varnished? can't we have varnished? can't you have varnished? can't they have varnished?
V-ing perfect
can't I have been varnishing? can't you have been varnishing? can't he have been varnishing? can't we have been varnishing? can't you have been varnishing? can't they have been varnishing?