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 couldn't expurgate you couldn't expurgate he couldn't expurgate we couldn't expurgate you couldn't expurgate they couldn't expurgate	I couldn't be expurgating you couldn't be expurgating he couldn't be expurgating we couldn't be expurgating you couldn't be expurgating they couldn't be expurgating
Perfect	V-ing perfect
I couldn't have expurgated you couldn't have expurgated he couldn't have expurgated we couldn't have expurgated you couldn't have expurgated they couldn't have expurgated	I couldn't have been expurgating you couldn't have been expurgating he couldn't have been expurgating we couldn't have been expurgating you couldn't have been expurgating they couldn't 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
couldn't I expurgate? couldn't you expurgate? couldn't he expurgate? couldn't we expurgate? couldn't you expurgate? couldn't they expurgate?	couldn't I be expurgating? couldn't you be expurgating? couldn't he be expurgating? couldn't we be expurgating? couldn't you be expurgating? couldn't they be expurgating?
Perfect	V-ing perfect
couldn't I have expurgated? couldn't you have expurgated? couldn't he have expurgated? couldn't we have expurgated? couldn't you have expurgated? couldn't they have expurgated?	couldn't I have been expurgating? couldn't you have been expurgating? couldn't he have been expurgating? couldn't we have been expurgating? couldn't you have been expurgating? couldn't they have been expurgating?