could behave
Verbo regular: behave - behaved- behaved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could behave
you could behave
he could behave
we could behave
you could behave
they could behave 	I could be behaving
you could be behaving
he could be behaving
we could be behaving
you could be behaving
they could be behaving	I could have behaved
you could have behaved
he could have behaved
we could have behaved
you could have behaved
they could have behaved	I could have been behaving
you could have been behaving
he could have been behaving
we could have been behaving
you could have been behaving
they could have been behaving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't behave
you couldn't behave
he couldn't behave
we couldn't behave
you couldn't behave
they couldn't behave 	I couldn't be behaving
you couldn't be behaving
he couldn't be behaving
we couldn't be behaving
you couldn't be behaving
they couldn't be behaving	I couldn't have behaved
you couldn't have behaved
he couldn't have behaved
we couldn't have behaved
you couldn't have behaved
they couldn't have behaved	I couldn't have been behaving
you couldn't have been behaving
he couldn't have been behaving
we couldn't have been behaving
you couldn't have been behaving
they couldn't have been behaving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I behave?
could you behave?
could he behave?
could we behave?
could you behave?
could they behave? 	could I be behaving?
could you be behaving?
could he be behaving?
could we be behaving?
could you be behaving?
could they be behaving? 	could I have behaved?
could you have behaved?
could he have behaved?
could we have behaved?
could you have behaved?
could they have behaved? 	could I have been behaving?
could you have been behaving?
could he have been behaving?
could we have been behaving?
could you have been behaving?
could they have been behaving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I behave?
couldn't you behave?
couldn't he behave?
couldn't we behave?
couldn't you behave?
couldn't they behave? 	couldn't I be behaving?
couldn't you be behaving?
couldn't he be behaving?
couldn't we be behaving?
couldn't you be behaving?
couldn't they be behaving? 	couldn't I have behaved?
couldn't you have behaved?
couldn't he have behaved?
couldn't we have behaved?
couldn't you have behaved?
couldn't they have behaved? 	couldn't I have been behaving?
couldn't you have been behaving?
couldn't he have been behaving?
couldn't we have been behaving?
couldn't you have been behaving?
couldn't they have been behaving?