could tax
Verbo regular: tax - taxed- taxed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tax
you could tax
he could tax
we could tax
you could tax
they could tax 	I could be taxing
you could be taxing
he could be taxing
we could be taxing
you could be taxing
they could be taxing	I could have taxed
you could have taxed
he could have taxed
we could have taxed
you could have taxed
they could have taxed	I could have been taxing
you could have been taxing
he could have been taxing
we could have been taxing
you could have been taxing
they could have been taxing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not tax
you could not tax
he could not tax
we could not tax
you could not tax
they could not tax 	I could not be taxing
you could not be taxing
he could not be taxing
we could not be taxing
you could not be taxing
they could not be taxing	I could not have taxed
you could not have taxed
he could not have taxed
we could not have taxed
you could not have taxed
they could not have taxed	I could not have been taxing
you could not have been taxing
he could not have been taxing
we could not have been taxing
you could not have been taxing
they could not have been taxing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tax?
could you tax?
could he tax?
could we tax?
could you tax?
could they tax? 	could I be taxing?
could you be taxing?
could he be taxing?
could we be taxing?
could you be taxing?
could they be taxing? 	could I have taxed?
could you have taxed?
could he have taxed?
could we have taxed?
could you have taxed?
could they have taxed? 	could I have been taxing?
could you have been taxing?
could he have been taxing?
could we have been taxing?
could you have been taxing?
could they have been taxing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not tax?
could you not tax?
could he not tax?
could we not tax?
could you not tax?
could they not tax? 	could I not be taxing?
could you not be taxing?
could he not be taxing?
could we not be taxing?
could you not be taxing?
could they not be taxing? 	could I not have taxed?
could you not have taxed?
could he not have taxed?
could we not have taxed?
could you not have taxed?
could they not have taxed? 	could I not have been taxing?
could you not have been taxing?
could he not have been taxing?
could we not have been taxing?
could you not have been taxing?
could they not have been taxing?