could fast
Verbo regular: fast - fasted- fasted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could fast
you could fast
she could fast
we could fast
you could fast
they could fast 	I could be fasting
you could be fasting
she could be fasting
we could be fasting
you could be fasting
they could be fasting	I could have fasted
you could have fasted
she could have fasted
we could have fasted
you could have fasted
they could have fasted	I could have been fasting
you could have been fasting
she could have been fasting
we could have been fasting
you could have been fasting
they could have been fasting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not fast
you could not fast
she could not fast
we could not fast
you could not fast
they could not fast 	I could not be fasting
you could not be fasting
she could not be fasting
we could not be fasting
you could not be fasting
they could not be fasting	I could not have fasted
you could not have fasted
she could not have fasted
we could not have fasted
you could not have fasted
they could not have fasted	I could not have been fasting
you could not have been fasting
she could not have been fasting
we could not have been fasting
you could not have been fasting
they could not have been fasting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I fast?
could you fast?
could she fast?
could we fast?
could you fast?
could they fast? 	could I be fasting?
could you be fasting?
could she be fasting?
could we be fasting?
could you be fasting?
could they be fasting? 	could I have fasted?
could you have fasted?
could she have fasted?
could we have fasted?
could you have fasted?
could they have fasted? 	could I have been fasting?
could you have been fasting?
could she have been fasting?
could we have been fasting?
could you have been fasting?
could they have been fasting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not fast?
could you not fast?
could she not fast?
could we not fast?
could you not fast?
could they not fast? 	could I not be fasting?
could you not be fasting?
could she not be fasting?
could we not be fasting?
could you not be fasting?
could they not be fasting? 	could I not have fasted?
could you not have fasted?
could she not have fasted?
could we not have fasted?
could you not have fasted?
could they not have fasted? 	could I not have been fasting?
could you not have been fasting?
could she not have been fasting?
could we not have been fasting?
could you not have been fasting?
could they not have been fasting?