English verb conjugation
COULD TAN

Regular verb: tan - tanned - tanned

Affirmation

Simple form	V-ing form
I could tan you could tan she could tan we could tan you could tan they could tan	I could be tanning you could be tanning she could be tanning we could be tanning you could be tanning they could be tanning
Perfect	V-ing perfect
I could have tanned you could have tanned she could have tanned we could have tanned you could have tanned they could have tanned	I could have been tanning you could have been tanning she could have been tanning we could have been tanning you could have been tanning they could have been tanning

Negation

Simple form	V-ing form
I couldn't tan you couldn't tan she couldn't tan we couldn't tan you couldn't tan they couldn't tan	I couldn't be tanning you couldn't be tanning she couldn't be tanning we couldn't be tanning you couldn't be tanning they couldn't be tanning
Perfect	V-ing perfect
I couldn't have tanned you couldn't have tanned she couldn't have tanned we couldn't have tanned you couldn't have tanned they couldn't have tanned	I couldn't have been tanning you couldn't have been tanning she couldn't have been tanning we couldn't have been tanning you couldn't have been tanning they couldn't have been tanning

Interrogative form

Simple form	V-ing form
could I tan? could you tan? could she tan? could we tan? could you tan? could they tan?	could I be tanning? could you be tanning? could she be tanning? could we be tanning? could you be tanning? could they be tanning?
Perfect	V-ing perfect
could I have tanned? could you have tanned? could she have tanned? could we have tanned? could you have tanned? could they have tanned?	could I have been tanning? could you have been tanning? could she have been tanning? could we have been tanning? could you have been tanning? could they have been tanning?

Interro-negative form

Simple form	V-ing form
couldn't I tan? couldn't you tan? couldn't she tan? couldn't we tan? couldn't you tan? couldn't they tan?	couldn't I be tanning? couldn't you be tanning? couldn't she be tanning? couldn't we be tanning? couldn't you be tanning? couldn't they be tanning?
Perfect	V-ing perfect
couldn't I have tanned? couldn't you have tanned? couldn't she have tanned? couldn't we have tanned? couldn't you have tanned? couldn't they have tanned?	couldn't I have been tanning? couldn't you have been tanning? couldn't she have been tanning? couldn't we have been tanning? couldn't you have been tanning? couldn't they have been tanning?