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 couldn't thank you couldn't thank she couldn't thank we couldn't thank you couldn't thank they couldn't thank	I couldn't be thanking you couldn't be thanking she couldn't be thanking we couldn't be thanking you couldn't be thanking they couldn't be thanking
Perfect	V-ing perfect
I couldn't have thanked you couldn't have thanked she couldn't have thanked we couldn't have thanked you couldn't have thanked they couldn't have thanked	I couldn't have been thanking you couldn't have been thanking she couldn't have been thanking we couldn't have been thanking you couldn't have been thanking they couldn't 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
couldn't I thank? couldn't you thank? couldn't she thank? couldn't we thank? couldn't you thank? couldn't they thank?	couldn't I be thanking? couldn't you be thanking? couldn't she be thanking? couldn't we be thanking? couldn't you be thanking? couldn't they be thanking?
Perfect	V-ing perfect
couldn't I have thanked? couldn't you have thanked? couldn't she have thanked? couldn't we have thanked? couldn't you have thanked? couldn't they have thanked?	couldn't I have been thanking? couldn't you have been thanking? couldn't she have been thanking? couldn't we have been thanking? couldn't you have been thanking? couldn't they have been thanking?