English verb conjugation
COULD EXCRETE

Regular verb: excrete - excreted - excreted

Affirmation

Simple form	V-ing form
I could excrete you could excrete he could excrete we could excrete you could excrete they could excrete	I could be excreting you could be excreting he could be excreting we could be excreting you could be excreting they could be excreting
Perfect	V-ing perfect
I could have excreted you could have excreted he could have excreted we could have excreted you could have excreted they could have excreted	I could have been excreting you could have been excreting he could have been excreting we could have been excreting you could have been excreting they could have been excreting

Negation

Simple form	V-ing form
I could not excrete you could not excrete he could not excrete we could not excrete you could not excrete they could not excrete	I could not be excreting you could not be excreting he could not be excreting we could not be excreting you could not be excreting they could not be excreting
Perfect	V-ing perfect
I could not have excreted you could not have excreted he could not have excreted we could not have excreted you could not have excreted they could not have excreted	I could not have been excreting you could not have been excreting he could not have been excreting we could not have been excreting you could not have been excreting they could not have been excreting

Interrogative form

Simple form	V-ing form
could I excrete? could you excrete? could he excrete? could we excrete? could you excrete? could they excrete?	could I be excreting? could you be excreting? could he be excreting? could we be excreting? could you be excreting? could they be excreting?
Perfect	V-ing perfect
could I have excreted? could you have excreted? could he have excreted? could we have excreted? could you have excreted? could they have excreted?	could I have been excreting? could you have been excreting? could he have been excreting? could we have been excreting? could you have been excreting? could they have been excreting?

Interro-negative form

Simple form	V-ing form
could I not excrete? could you not excrete? could he not excrete? could we not excrete? could you not excrete? could they not excrete?	could I not be excreting? could you not be excreting? could he not be excreting? could we not be excreting? could you not be excreting? could they not be excreting?
Perfect	V-ing perfect
could I not have excreted? could you not have excreted? could he not have excreted? could we not have excreted? could you not have excreted? could they not have excreted?	could I not have been excreting? could you not have been excreting? could he not have been excreting? could we not have been excreting? could you not have been excreting? could they not have been excreting?