could precaution
Verbo regular: precaution - precautioned- precautioned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could precaution
you could precaution
he could precaution
we could precaution
you could precaution
they could precaution 	I could be precautioning
you could be precautioning
he could be precautioning
we could be precautioning
you could be precautioning
they could be precautioning	I could have precautioned
you could have precautioned
he could have precautioned
we could have precautioned
you could have precautioned
they could have precautioned	I could have been precautioning
you could have been precautioning
he could have been precautioning
we could have been precautioning
you could have been precautioning
they could have been precautioning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not precaution
you could not precaution
he could not precaution
we could not precaution
you could not precaution
they could not precaution 	I could not be precautioning
you could not be precautioning
he could not be precautioning
we could not be precautioning
you could not be precautioning
they could not be precautioning	I could not have precautioned
you could not have precautioned
he could not have precautioned
we could not have precautioned
you could not have precautioned
they could not have precautioned	I could not have been precautioning
you could not have been precautioning
he could not have been precautioning
we could not have been precautioning
you could not have been precautioning
they could not have been precautioning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I precaution?
could you precaution?
could he precaution?
could we precaution?
could you precaution?
could they precaution? 	could I be precautioning?
could you be precautioning?
could he be precautioning?
could we be precautioning?
could you be precautioning?
could they be precautioning? 	could I have precautioned?
could you have precautioned?
could he have precautioned?
could we have precautioned?
could you have precautioned?
could they have precautioned? 	could I have been precautioning?
could you have been precautioning?
could he have been precautioning?
could we have been precautioning?
could you have been precautioning?
could they have been precautioning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not precaution?
could you not precaution?
could he not precaution?
could we not precaution?
could you not precaution?
could they not precaution? 	could I not be precautioning?
could you not be precautioning?
could he not be precautioning?
could we not be precautioning?
could you not be precautioning?
could they not be precautioning? 	could I not have precautioned?
could you not have precautioned?
could he not have precautioned?
could we not have precautioned?
could you not have precautioned?
could they not have precautioned? 	could I not have been precautioning?
could you not have been precautioning?
could he not have been precautioning?
could we not have been precautioning?
could you not have been precautioning?
could they not have been precautioning?