English verb conjugation
COULD THIN

Regular verb: thin - thinned - thinned

Affirmation

Simple form	V-ing form
I could thin you could thin she could thin we could thin you could thin they could thin	I could be thinning you could be thinning she could be thinning we could be thinning you could be thinning they could be thinning
Perfect	V-ing perfect
I could have thinned you could have thinned she could have thinned we could have thinned you could have thinned they could have thinned	I could have been thinning you could have been thinning she could have been thinning we could have been thinning you could have been thinning they could have been thinning

Negation

Simple form	V-ing form
I couldn't thin you couldn't thin she couldn't thin we couldn't thin you couldn't thin they couldn't thin	I couldn't be thinning you couldn't be thinning she couldn't be thinning we couldn't be thinning you couldn't be thinning they couldn't be thinning
Perfect	V-ing perfect
I couldn't have thinned you couldn't have thinned she couldn't have thinned we couldn't have thinned you couldn't have thinned they couldn't have thinned	I couldn't have been thinning you couldn't have been thinning she couldn't have been thinning we couldn't have been thinning you couldn't have been thinning they couldn't have been thinning

Interrogative form

Simple form	V-ing form
could I thin? could you thin? could she thin? could we thin? could you thin? could they thin?	could I be thinning? could you be thinning? could she be thinning? could we be thinning? could you be thinning? could they be thinning?
Perfect	V-ing perfect
could I have thinned? could you have thinned? could she have thinned? could we have thinned? could you have thinned? could they have thinned?	could I have been thinning? could you have been thinning? could she have been thinning? could we have been thinning? could you have been thinning? could they have been thinning?

Interro-negative form

Simple form	V-ing form
couldn't I thin? couldn't you thin? couldn't she thin? couldn't we thin? couldn't you thin? couldn't they thin?	couldn't I be thinning? couldn't you be thinning? couldn't she be thinning? couldn't we be thinning? couldn't you be thinning? couldn't they be thinning?
Perfect	V-ing perfect
couldn't I have thinned? couldn't you have thinned? couldn't she have thinned? couldn't we have thinned? couldn't you have thinned? couldn't they have thinned?	couldn't I have been thinning? couldn't you have been thinning? couldn't she have been thinning? couldn't we have been thinning? couldn't you have been thinning? couldn't they have been thinning?