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 couldn't excrete you couldn't excrete he couldn't excrete we couldn't excrete you couldn't excrete they couldn't excrete	I couldn't be excreting you couldn't be excreting he couldn't be excreting we couldn't be excreting you couldn't be excreting they couldn't be excreting
Perfect	V-ing perfect
I couldn't have excreted you couldn't have excreted he couldn't have excreted we couldn't have excreted you couldn't have excreted they couldn't have excreted	I couldn't have been excreting you couldn't have been excreting he couldn't have been excreting we couldn't have been excreting you couldn't have been excreting they couldn't 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
couldn't I excrete? couldn't you excrete? couldn't he excrete? couldn't we excrete? couldn't you excrete? couldn't they excrete?	couldn't I be excreting? couldn't you be excreting? couldn't he be excreting? couldn't we be excreting? couldn't you be excreting? couldn't they be excreting?
Perfect	V-ing perfect
couldn't I have excreted? couldn't you have excreted? couldn't he have excreted? couldn't we have excreted? couldn't you have excreted? couldn't they have excreted?	couldn't I have been excreting? couldn't you have been excreting? couldn't he have been excreting? couldn't we have been excreting? couldn't you have been excreting? couldn't they have been excreting?