English verb conjugation
COULD SERGE

Regular verb: serge - serged - serged

Affirmation

Simple form	V-ing form
I could serge you could serge he could serge we could serge you could serge they could serge	I could be serging you could be serging he could be serging we could be serging you could be serging they could be serging
Perfect	V-ing perfect
I could have serged you could have serged he could have serged we could have serged you could have serged they could have serged	I could have been serging you could have been serging he could have been serging we could have been serging you could have been serging they could have been serging

Negation

Simple form	V-ing form
I could not serge you could not serge he could not serge we could not serge you could not serge they could not serge	I could not be serging you could not be serging he could not be serging we could not be serging you could not be serging they could not be serging
Perfect	V-ing perfect
I could not have serged you could not have serged he could not have serged we could not have serged you could not have serged they could not have serged	I could not have been serging you could not have been serging he could not have been serging we could not have been serging you could not have been serging they could not have been serging

Interrogative form

Simple form	V-ing form
could I serge? could you serge? could he serge? could we serge? could you serge? could they serge?	could I be serging? could you be serging? could he be serging? could we be serging? could you be serging? could they be serging?
Perfect	V-ing perfect
could I have serged? could you have serged? could he have serged? could we have serged? could you have serged? could they have serged?	could I have been serging? could you have been serging? could he have been serging? could we have been serging? could you have been serging? could they have been serging?

Interro-negative form

Simple form	V-ing form
could I not serge? could you not serge? could he not serge? could we not serge? could you not serge? could they not serge?	could I not be serging? could you not be serging? could he not be serging? could we not be serging? could you not be serging? could they not be serging?
Perfect	V-ing perfect
could I not have serged? could you not have serged? could he not have serged? could we not have serged? could you not have serged? could they not have serged?	could I not have been serging? could you not have been serging? could he not have been serging? could we not have been serging? could you not have been serging? could they not have been serging?