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 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	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 	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 	
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? 	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?