English verb conjugation
COULD CREDIT

Regular verb: credit - credited - credited

Affirmation

Simple form	V-ing form
I could credit you could credit he could credit we could credit you could credit they could credit	I could be crediting you could be crediting he could be crediting we could be crediting you could be crediting they could be crediting
Perfect	V-ing perfect
I could have credited you could have credited he could have credited we could have credited you could have credited they could have credited	I could have been crediting you could have been crediting he could have been crediting we could have been crediting you could have been crediting they could have been crediting

Negation

Simple form	V-ing form
I could not credit you could not credit he could not credit we could not credit you could not credit they could not credit	I could not be crediting you could not be crediting he could not be crediting we could not be crediting you could not be crediting they could not be crediting
Perfect	V-ing perfect
I could not have credited you could not have credited he could not have credited we could not have credited you could not have credited they could not have credited	I could not have been crediting you could not have been crediting he could not have been crediting we could not have been crediting you could not have been crediting they could not have been crediting

Interrogative form

Simple form	V-ing form
could I credit? could you credit? could he credit? could we credit? could you credit? could they credit?	could I be crediting? could you be crediting? could he be crediting? could we be crediting? could you be crediting? could they be crediting?
Perfect	V-ing perfect
could I have credited? could you have credited? could he have credited? could we have credited? could you have credited? could they have credited?	could I have been crediting? could you have been crediting? could he have been crediting? could we have been crediting? could you have been crediting? could they have been crediting?

Interro-negative form

Simple form	V-ing form
could I not credit? could you not credit? could he not credit? could we not credit? could you not credit? could they not credit?	could I not be crediting? could you not be crediting? could he not be crediting? could we not be crediting? could you not be crediting? could they not be crediting?
Perfect	V-ing perfect
could I not have credited? could you not have credited? could he not have credited? could we not have credited? could you not have credited? could they not have credited?	could I not have been crediting? could you not have been crediting? could he not have been crediting? could we not have been crediting? could you not have been crediting? could they not have been crediting?