could thank
Verbo regular: thank - thanked- thanked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could thank
you could thank
he could thank
we could thank
you could thank
they could thank 	I could be thanking
you could be thanking
he could be thanking
we could be thanking
you could be thanking
they could be thanking	I could have thanked
you could have thanked
he could have thanked
we could have thanked
you could have thanked
they could have thanked	I could have been thanking
you could have been thanking
he could have been thanking
we could have been thanking
you could have been thanking
they could have been thanking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not thank
you could not thank
he could not thank
we could not thank
you could not thank
they could not thank 	I could not be thanking
you could not be thanking
he could not be thanking
we could not be thanking
you could not be thanking
they could not be thanking	I could not have thanked
you could not have thanked
he could not have thanked
we could not have thanked
you could not have thanked
they could not have thanked	I could not have been thanking
you could not have been thanking
he could not have been thanking
we could not have been thanking
you could not have been thanking
they could not have been thanking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I thank?
could you thank?
could he thank?
could we thank?
could you thank?
could they thank? 	could I be thanking?
could you be thanking?
could he be thanking?
could we be thanking?
could you be thanking?
could they be thanking? 	could I have thanked?
could you have thanked?
could he have thanked?
could we have thanked?
could you have thanked?
could they have thanked? 	could I have been thanking?
could you have been thanking?
could he have been thanking?
could we have been thanking?
could you have been thanking?
could they have been thanking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not thank?
could you not thank?
could he not thank?
could we not thank?
could you not thank?
could they not thank? 	could I not be thanking?
could you not be thanking?
could he not be thanking?
could we not be thanking?
could you not be thanking?
could they not be thanking? 	could I not have thanked?
could you not have thanked?
could he not have thanked?
could we not have thanked?
could you not have thanked?
could they not have thanked? 	could I not have been thanking?
could you not have been thanking?
could he not have been thanking?
could we not have been thanking?
could you not have been thanking?
could they not have been thanking?