English verb conjugation
COULD THANK

Regular verb: thank - thanked - thanked

Affirmation

Simple form	V-ing form
I could thank you could thank she could thank we could thank you could thank they could thank	I could be thanking you could be thanking she could be thanking we could be thanking you could be thanking they could be thanking
Perfect	V-ing perfect
I could have thanked you could have thanked she could have thanked we could have thanked you could have thanked they could have thanked	I could have been thanking you could have been thanking she could have been thanking we could have been thanking you could have been thanking they could have been thanking

Negation

Simple form	V-ing form
I could not thank you could not thank she could not thank we could not thank you could not thank they could not thank	I could not be thanking you could not be thanking she could not be thanking we could not be thanking you could not be thanking they could not be thanking
Perfect	V-ing perfect
I could not have thanked you could not have thanked she could not have thanked we could not have thanked you could not have thanked they could not have thanked	I could not have been thanking you could not have been thanking she could not have been thanking we could not have been thanking you could not have been thanking they could not have been thanking

Interrogative form

Simple form	V-ing form
could I thank? could you thank? could she thank? could we thank? could you thank? could they thank?	could I be thanking? could you be thanking? could she be thanking? could we be thanking? could you be thanking? could they be thanking?
Perfect	V-ing perfect
could I have thanked? could you have thanked? could she have thanked? could we have thanked? could you have thanked? could they have thanked?	could I have been thanking? could you have been thanking? could she have been thanking? could we have been thanking? could you have been thanking? could they have been thanking?

Interro-negative form

Simple form	V-ing form
could I not thank? could you not thank? could she not thank? could we not thank? could you not thank? could they not thank?	could I not be thanking? could you not be thanking? could she not be thanking? could we not be thanking? could you not be thanking? could they not be thanking?
Perfect	V-ing perfect
could I not have thanked? could you not have thanked? could she not have thanked? could we not have thanked? could you not have thanked? could they not have thanked?	could I not have been thanking? could you not have been thanking? could she not have been thanking? could we not have been thanking? could you not have been thanking? could they not have been thanking?