English verb conjugation
COULD CLOG

Regular verb: clog - clogged - clogged

Affirmation

Simple form	V-ing form
I could clog you could clog he could clog we could clog you could clog they could clog	I could be clogging you could be clogging he could be clogging we could be clogging you could be clogging they could be clogging
Perfect	V-ing perfect
I could have clogged you could have clogged he could have clogged we could have clogged you could have clogged they could have clogged	I could have been clogging you could have been clogging he could have been clogging we could have been clogging you could have been clogging they could have been clogging

Negation

Simple form	V-ing form
I could not clog you could not clog he could not clog we could not clog you could not clog they could not clog	I could not be clogging you could not be clogging he could not be clogging we could not be clogging you could not be clogging they could not be clogging
Perfect	V-ing perfect
I could not have clogged you could not have clogged he could not have clogged we could not have clogged you could not have clogged they could not have clogged	I could not have been clogging you could not have been clogging he could not have been clogging we could not have been clogging you could not have been clogging they could not have been clogging

Interrogative form

Simple form	V-ing form
could I clog? could you clog? could he clog? could we clog? could you clog? could they clog?	could I be clogging? could you be clogging? could he be clogging? could we be clogging? could you be clogging? could they be clogging?
Perfect	V-ing perfect
could I have clogged? could you have clogged? could he have clogged? could we have clogged? could you have clogged? could they have clogged?	could I have been clogging? could you have been clogging? could he have been clogging? could we have been clogging? could you have been clogging? could they have been clogging?

Interro-negative form

Simple form	V-ing form
could I not clog? could you not clog? could he not clog? could we not clog? could you not clog? could they not clog?	could I not be clogging? could you not be clogging? could he not be clogging? could we not be clogging? could you not be clogging? could they not be clogging?
Perfect	V-ing perfect
could I not have clogged? could you not have clogged? could he not have clogged? could we not have clogged? could you not have clogged? could they not have clogged?	could I not have been clogging? could you not have been clogging? could he not have been clogging? could we not have been clogging? could you not have been clogging? could they not have been clogging?