could undertake
Verbo irregular: undertake - undertook- undertaken

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could undertake
you could undertake
he could undertake
we could undertake
you could undertake
they could undertake 	I could be undertaking
you could be undertaking
he could be undertaking
we could be undertaking
you could be undertaking
they could be undertaking	I could have undertaken
you could have undertaken
he could have undertaken
we could have undertaken
you could have undertaken
they could have undertaken	I could have been undertaking
you could have been undertaking
he could have been undertaking
we could have been undertaking
you could have been undertaking
they could have been undertaking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not undertake
you could not undertake
he could not undertake
we could not undertake
you could not undertake
they could not undertake 	I could not be undertaking
you could not be undertaking
he could not be undertaking
we could not be undertaking
you could not be undertaking
they could not be undertaking	I could not have undertaken
you could not have undertaken
he could not have undertaken
we could not have undertaken
you could not have undertaken
they could not have undertaken	I could not have been undertaking
you could not have been undertaking
he could not have been undertaking
we could not have been undertaking
you could not have been undertaking
they could not have been undertaking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I undertake?
could you undertake?
could he undertake?
could we undertake?
could you undertake?
could they undertake? 	could I be undertaking?
could you be undertaking?
could he be undertaking?
could we be undertaking?
could you be undertaking?
could they be undertaking? 	could I have undertaken?
could you have undertaken?
could he have undertaken?
could we have undertaken?
could you have undertaken?
could they have undertaken? 	could I have been undertaking?
could you have been undertaking?
could he have been undertaking?
could we have been undertaking?
could you have been undertaking?
could they have been undertaking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not undertake?
could you not undertake?
could he not undertake?
could we not undertake?
could you not undertake?
could they not undertake? 	could I not be undertaking?
could you not be undertaking?
could he not be undertaking?
could we not be undertaking?
could you not be undertaking?
could they not be undertaking? 	could I not have undertaken?
could you not have undertaken?
could he not have undertaken?
could we not have undertaken?
could you not have undertaken?
could they not have undertaken? 	could I not have been undertaking?
could you not have been undertaking?
could he not have been undertaking?
could we not have been undertaking?
could you not have been undertaking?
could they not have been undertaking?