could throb
Verbo regular: throb - throbbed- throbbed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could throb
you could throb
he could throb
we could throb
you could throb
they could throb 	I could be throbbing
you could be throbbing
he could be throbbing
we could be throbbing
you could be throbbing
they could be throbbing	I could have throbbed
you could have throbbed
he could have throbbed
we could have throbbed
you could have throbbed
they could have throbbed	I could have been throbbing
you could have been throbbing
he could have been throbbing
we could have been throbbing
you could have been throbbing
they could have been throbbing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not throb
you could not throb
he could not throb
we could not throb
you could not throb
they could not throb 	I could not be throbbing
you could not be throbbing
he could not be throbbing
we could not be throbbing
you could not be throbbing
they could not be throbbing	I could not have throbbed
you could not have throbbed
he could not have throbbed
we could not have throbbed
you could not have throbbed
they could not have throbbed	I could not have been throbbing
you could not have been throbbing
he could not have been throbbing
we could not have been throbbing
you could not have been throbbing
they could not have been throbbing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I throb?
could you throb?
could he throb?
could we throb?
could you throb?
could they throb? 	could I be throbbing?
could you be throbbing?
could he be throbbing?
could we be throbbing?
could you be throbbing?
could they be throbbing? 	could I have throbbed?
could you have throbbed?
could he have throbbed?
could we have throbbed?
could you have throbbed?
could they have throbbed? 	could I have been throbbing?
could you have been throbbing?
could he have been throbbing?
could we have been throbbing?
could you have been throbbing?
could they have been throbbing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not throb?
could you not throb?
could he not throb?
could we not throb?
could you not throb?
could they not throb? 	could I not be throbbing?
could you not be throbbing?
could he not be throbbing?
could we not be throbbing?
could you not be throbbing?
could they not be throbbing? 	could I not have throbbed?
could you not have throbbed?
could he not have throbbed?
could we not have throbbed?
could you not have throbbed?
could they not have throbbed? 	could I not have been throbbing?
could you not have been throbbing?
could he not have been throbbing?
could we not have been throbbing?
could you not have been throbbing?
could they not have been throbbing?