could taxi
Verbo regular: taxi - taxied- taxied

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could taxi
you could taxi
he could taxi
we could taxi
you could taxi
they could taxi 	I could be taxiing
you could be taxiing
he could be taxiing
we could be taxiing
you could be taxiing
they could be taxiing	I could have taxied
you could have taxied
he could have taxied
we could have taxied
you could have taxied
they could have taxied	I could have been taxiing
you could have been taxiing
he could have been taxiing
we could have been taxiing
you could have been taxiing
they could have been taxiing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not taxi
you could not taxi
he could not taxi
we could not taxi
you could not taxi
they could not taxi 	I could not be taxiing
you could not be taxiing
he could not be taxiing
we could not be taxiing
you could not be taxiing
they could not be taxiing	I could not have taxied
you could not have taxied
he could not have taxied
we could not have taxied
you could not have taxied
they could not have taxied	I could not have been taxiing
you could not have been taxiing
he could not have been taxiing
we could not have been taxiing
you could not have been taxiing
they could not have been taxiing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I taxi?
could you taxi?
could he taxi?
could we taxi?
could you taxi?
could they taxi? 	could I be taxiing?
could you be taxiing?
could he be taxiing?
could we be taxiing?
could you be taxiing?
could they be taxiing? 	could I have taxied?
could you have taxied?
could he have taxied?
could we have taxied?
could you have taxied?
could they have taxied? 	could I have been taxiing?
could you have been taxiing?
could he have been taxiing?
could we have been taxiing?
could you have been taxiing?
could they have been taxiing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not taxi?
could you not taxi?
could he not taxi?
could we not taxi?
could you not taxi?
could they not taxi? 	could I not be taxiing?
could you not be taxiing?
could he not be taxiing?
could we not be taxiing?
could you not be taxiing?
could they not be taxiing? 	could I not have taxied?
could you not have taxied?
could he not have taxied?
could we not have taxied?
could you not have taxied?
could they not have taxied? 	could I not have been taxiing?
could you not have been taxiing?
could he not have been taxiing?
could we not have been taxiing?
could you not have been taxiing?
could they not have been taxiing?