could petition
Verbo regular: petition - petitioned- petitioned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could petition
you could petition
he could petition
we could petition
you could petition
they could petition 	I could be petitioning
you could be petitioning
he could be petitioning
we could be petitioning
you could be petitioning
they could be petitioning	I could have petitioned
you could have petitioned
he could have petitioned
we could have petitioned
you could have petitioned
they could have petitioned	I could have been petitioning
you could have been petitioning
he could have been petitioning
we could have been petitioning
you could have been petitioning
they could have been petitioning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't petition
you couldn't petition
he couldn't petition
we couldn't petition
you couldn't petition
they couldn't petition 	I couldn't be petitioning
you couldn't be petitioning
he couldn't be petitioning
we couldn't be petitioning
you couldn't be petitioning
they couldn't be petitioning	I couldn't have petitioned
you couldn't have petitioned
he couldn't have petitioned
we couldn't have petitioned
you couldn't have petitioned
they couldn't have petitioned	I couldn't have been petitioning
you couldn't have been petitioning
he couldn't have been petitioning
we couldn't have been petitioning
you couldn't have been petitioning
they couldn't have been petitioning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I petition?
could you petition?
could he petition?
could we petition?
could you petition?
could they petition? 	could I be petitioning?
could you be petitioning?
could he be petitioning?
could we be petitioning?
could you be petitioning?
could they be petitioning? 	could I have petitioned?
could you have petitioned?
could he have petitioned?
could we have petitioned?
could you have petitioned?
could they have petitioned? 	could I have been petitioning?
could you have been petitioning?
could he have been petitioning?
could we have been petitioning?
could you have been petitioning?
could they have been petitioning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I petition?
couldn't you petition?
couldn't he petition?
couldn't we petition?
couldn't you petition?
couldn't they petition? 	couldn't I be petitioning?
couldn't you be petitioning?
couldn't he be petitioning?
couldn't we be petitioning?
couldn't you be petitioning?
couldn't they be petitioning? 	couldn't I have petitioned?
couldn't you have petitioned?
couldn't he have petitioned?
couldn't we have petitioned?
couldn't you have petitioned?
couldn't they have petitioned? 	couldn't I have been petitioning?
couldn't you have been petitioning?
couldn't he have been petitioning?
couldn't we have been petitioning?
couldn't you have been petitioning?
couldn't they have been petitioning?