can contest
Verbo regular: contest - contested- contested

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can contest
you can contest
she can contest
we can contest
you can contest
they can contest 	I can be contesting
you can be contesting
she can be contesting
we can be contesting
you can be contesting
they can be contesting	I can have contested
you can have contested
she can have contested
we can have contested
you can have contested
they can have contested	I can have been contesting
you can have been contesting
she can have been contesting
we can have been contesting
you can have been contesting
they can have been contesting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot contest
you cannot contest
she cannot contest
we cannot contest
you cannot contest
they cannot contest 	I cannot be contesting
you cannot be contesting
she cannot be contesting
we cannot be contesting
you cannot be contesting
they cannot be contesting	I cannot have contested
you cannot have contested
she cannot have contested
we cannot have contested
you cannot have contested
they cannot have contested	I cannot have been contesting
you cannot have been contesting
she cannot have been contesting
we cannot have been contesting
you cannot have been contesting
they cannot have been contesting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I contest?
can you contest?
can she contest?
can we contest?
can you contest?
can they contest? 	can I be contesting?
can you be contesting?
can she be contesting?
can we be contesting?
can you be contesting?
can they be contesting? 	can I have contested?
can you have contested?
can she have contested?
can we have contested?
can you have contested?
can they have contested? 	can I have been contesting?
can you have been contesting?
can she have been contesting?
can we have been contesting?
can you have been contesting?
can they have been contesting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not contest?
can you not contest?
can she not contest?
can we not contest?
can you not contest?
can they not contest? 	can I not be contesting?
can you not be contesting?
can she not be contesting?
can we not be contesting?
can you not be contesting?
can they not be contesting? 	can I not have contested?
can you not have contested?
can she not have contested?
can we not have contested?
can you not have contested?
can they not have contested? 	can I not have been contesting?
can you not have been contesting?
can she not have been contesting?
can we not have been contesting?
can you not have been contesting?
can they not have been contesting?