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 couldn't clog you couldn't clog he couldn't clog we couldn't clog you couldn't clog they couldn't clog	I couldn't be clogging you couldn't be clogging he couldn't be clogging we couldn't be clogging you couldn't be clogging they couldn't be clogging
Perfect	V-ing perfect
I couldn't have clogged you couldn't have clogged he couldn't have clogged we couldn't have clogged you couldn't have clogged they couldn't have clogged	I couldn't have been clogging you couldn't have been clogging he couldn't have been clogging we couldn't have been clogging you couldn't have been clogging they couldn't 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
couldn't I clog? couldn't you clog? couldn't he clog? couldn't we clog? couldn't you clog? couldn't they clog?	couldn't I be clogging? couldn't you be clogging? couldn't he be clogging? couldn't we be clogging? couldn't you be clogging? couldn't they be clogging?
Perfect	V-ing perfect
couldn't I have clogged? couldn't you have clogged? couldn't he have clogged? couldn't we have clogged? couldn't you have clogged? couldn't they have clogged?	couldn't I have been clogging? couldn't you have been clogging? couldn't he have been clogging? couldn't we have been clogging? couldn't you have been clogging? couldn't they have been clogging?