could serotype
Verbo regular: serotype - serotyped- serotyped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could serotype
you could serotype
he could serotype
we could serotype
you could serotype
they could serotype 	I could be serotyping
you could be serotyping
he could be serotyping
we could be serotyping
you could be serotyping
they could be serotyping	I could have serotyped
you could have serotyped
he could have serotyped
we could have serotyped
you could have serotyped
they could have serotyped	I could have been serotyping
you could have been serotyping
he could have been serotyping
we could have been serotyping
you could have been serotyping
they could have been serotyping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not serotype
you could not serotype
he could not serotype
we could not serotype
you could not serotype
they could not serotype 	I could not be serotyping
you could not be serotyping
he could not be serotyping
we could not be serotyping
you could not be serotyping
they could not be serotyping	I could not have serotyped
you could not have serotyped
he could not have serotyped
we could not have serotyped
you could not have serotyped
they could not have serotyped	I could not have been serotyping
you could not have been serotyping
he could not have been serotyping
we could not have been serotyping
you could not have been serotyping
they could not have been serotyping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I serotype?
could you serotype?
could he serotype?
could we serotype?
could you serotype?
could they serotype? 	could I be serotyping?
could you be serotyping?
could he be serotyping?
could we be serotyping?
could you be serotyping?
could they be serotyping? 	could I have serotyped?
could you have serotyped?
could he have serotyped?
could we have serotyped?
could you have serotyped?
could they have serotyped? 	could I have been serotyping?
could you have been serotyping?
could he have been serotyping?
could we have been serotyping?
could you have been serotyping?
could they have been serotyping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not serotype?
could you not serotype?
could he not serotype?
could we not serotype?
could you not serotype?
could they not serotype? 	could I not be serotyping?
could you not be serotyping?
could he not be serotyping?
could we not be serotyping?
could you not be serotyping?
could they not be serotyping? 	could I not have serotyped?
could you not have serotyped?
could he not have serotyped?
could we not have serotyped?
could you not have serotyped?
could they not have serotyped? 	could I not have been serotyping?
could you not have been serotyping?
could he not have been serotyping?
could we not have been serotyping?
could you not have been serotyping?
could they not have been serotyping?