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 could not thin you could not thin she could not thin we could not thin you could not thin they could not thin	I could not be thinning you could not be thinning she could not be thinning we could not be thinning you could not be thinning they could not be thinning
Perfect	V-ing perfect
I could not have thinned you could not have thinned she could not have thinned we could not have thinned you could not have thinned they could not have thinned	I could not have been thinning you could not have been thinning she could not have been thinning we could not have been thinning you could not have been thinning they could not 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
could I not thin? could you not thin? could she not thin? could we not thin? could you not thin? could they not thin?	could I not be thinning? could you not be thinning? could she not be thinning? could we not be thinning? could you not be thinning? could they not be thinning?
Perfect	V-ing perfect
could I not have thinned? could you not have thinned? could she not have thinned? could we not have thinned? could you not have thinned? could they not have thinned?	could I not have been thinning? could you not have been thinning? could she not have been thinning? could we not have been thinning? could you not have been thinning? could they not have been thinning?