English verb conjugation
COULD ADVANCE

Regular verb: advance - advanced - advanced

Affirmation

Simple form	V-ing form
I could advance you could advance she could advance we could advance you could advance they could advance	I could be advancing you could be advancing she could be advancing we could be advancing you could be advancing they could be advancing
Perfect	V-ing perfect
I could have advanced you could have advanced she could have advanced we could have advanced you could have advanced they could have advanced	I could have been advancing you could have been advancing she could have been advancing we could have been advancing you could have been advancing they could have been advancing

Negation

Simple form	V-ing form
I couldn't advance you couldn't advance she couldn't advance we couldn't advance you couldn't advance they couldn't advance	I couldn't be advancing you couldn't be advancing she couldn't be advancing we couldn't be advancing you couldn't be advancing they couldn't be advancing
Perfect	V-ing perfect
I couldn't have advanced you couldn't have advanced she couldn't have advanced we couldn't have advanced you couldn't have advanced they couldn't have advanced	I couldn't have been advancing you couldn't have been advancing she couldn't have been advancing we couldn't have been advancing you couldn't have been advancing they couldn't have been advancing

Interrogative form

Simple form	V-ing form
could I advance? could you advance? could she advance? could we advance? could you advance? could they advance?	could I be advancing? could you be advancing? could she be advancing? could we be advancing? could you be advancing? could they be advancing?
Perfect	V-ing perfect
could I have advanced? could you have advanced? could she have advanced? could we have advanced? could you have advanced? could they have advanced?	could I have been advancing? could you have been advancing? could she have been advancing? could we have been advancing? could you have been advancing? could they have been advancing?

Interro-negative form

Simple form	V-ing form
couldn't I advance? couldn't you advance? couldn't she advance? couldn't we advance? couldn't you advance? couldn't they advance?	couldn't I be advancing? couldn't you be advancing? couldn't she be advancing? couldn't we be advancing? couldn't you be advancing? couldn't they be advancing?
Perfect	V-ing perfect
couldn't I have advanced? couldn't you have advanced? couldn't she have advanced? couldn't we have advanced? couldn't you have advanced? couldn't they have advanced?	couldn't I have been advancing? couldn't you have been advancing? couldn't she have been advancing? couldn't we have been advancing? couldn't you have been advancing? couldn't they have been advancing?