could advance
Verbo regular: advance - advanced- advanced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could advance
you could advance
he could advance
we could advance
you could advance
they could advance 	I could be advancing
you could be advancing
he could be advancing
we could be advancing
you could be advancing
they could be advancing	I could have advanced
you could have advanced
he 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
he could have been advancing
we could have been advancing
you could have been advancing
they could have been advancing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't advance
you couldn't advance
he 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
he 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
he 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
he couldn't have been advancing
we couldn't have been advancing
you couldn't have been advancing
they couldn't have been advancing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I advance?
could you advance?
could he advance?
could we advance?
could you advance?
could they advance? 	could I be advancing?
could you be advancing?
could he be advancing?
could we be advancing?
could you be advancing?
could they be advancing? 	could I have advanced?
could you have advanced?
could he 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 he have been advancing?
could we have been advancing?
could you have been advancing?
could they have been advancing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I advance?
couldn't you advance?
couldn't he 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 he 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 he 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 he have been advancing?
couldn't we have been advancing?
couldn't you have been advancing?
couldn't they have been advancing?