could advance
Regular verb: advance - advanced- advanced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not advance
you could not advance
she could not advance
we could not advance
you could not advance
they could not advance 	I could not be advancing
you could not be advancing
she could not be advancing
we could not be advancing
you could not be advancing
they could not be advancing	I could not have advanced
you could not have advanced
she could not have advanced
we could not have advanced
you could not have advanced
they could not have advanced	I could not have been advancing
you could not have been advancing
she could not have been advancing
we could not have been advancing
you could not have been advancing
they could not have been advancing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not advance?
could you not advance?
could she not advance?
could we not advance?
could you not advance?
could they not advance? 	could I not be advancing?
could you not be advancing?
could she not be advancing?
could we not be advancing?
could you not be advancing?
could they not be advancing? 	could I not have advanced?
could you not have advanced?
could she not have advanced?
could we not have advanced?
could you not have advanced?
could they not have advanced? 	could I not have been advancing?
could you not have been advancing?
could she not have been advancing?
could we not have been advancing?
could you not have been advancing?
could they not have been advancing?