English verb conjugation
COULD EXPURGATE

Regular verb: expurgate - expurgated - expurgated

Affirmation

Simple form	V-ing form
I could expurgate you could expurgate he could expurgate we could expurgate you could expurgate they could expurgate	I could be expurgating you could be expurgating he could be expurgating we could be expurgating you could be expurgating they could be expurgating
Perfect	V-ing perfect
I could have expurgated you could have expurgated he could have expurgated we could have expurgated you could have expurgated they could have expurgated	I could have been expurgating you could have been expurgating he could have been expurgating we could have been expurgating you could have been expurgating they could have been expurgating

Negation

Simple form	V-ing form
I could not expurgate you could not expurgate he could not expurgate we could not expurgate you could not expurgate they could not expurgate	I could not be expurgating you could not be expurgating he could not be expurgating we could not be expurgating you could not be expurgating they could not be expurgating
Perfect	V-ing perfect
I could not have expurgated you could not have expurgated he could not have expurgated we could not have expurgated you could not have expurgated they could not have expurgated	I could not have been expurgating you could not have been expurgating he could not have been expurgating we could not have been expurgating you could not have been expurgating they could not have been expurgating

Interrogative form

Simple form	V-ing form
could I expurgate? could you expurgate? could he expurgate? could we expurgate? could you expurgate? could they expurgate?	could I be expurgating? could you be expurgating? could he be expurgating? could we be expurgating? could you be expurgating? could they be expurgating?
Perfect	V-ing perfect
could I have expurgated? could you have expurgated? could he have expurgated? could we have expurgated? could you have expurgated? could they have expurgated?	could I have been expurgating? could you have been expurgating? could he have been expurgating? could we have been expurgating? could you have been expurgating? could they have been expurgating?

Interro-negative form

Simple form	V-ing form
could I not expurgate? could you not expurgate? could he not expurgate? could we not expurgate? could you not expurgate? could they not expurgate?	could I not be expurgating? could you not be expurgating? could he not be expurgating? could we not be expurgating? could you not be expurgating? could they not be expurgating?
Perfect	V-ing perfect
could I not have expurgated? could you not have expurgated? could he not have expurgated? could we not have expurgated? could you not have expurgated? could they not have expurgated?	could I not have been expurgating? could you not have been expurgating? could he not have been expurgating? could we not have been expurgating? could you not have been expurgating? could they not have been expurgating?