could nibble
Verbo regular: nibble - nibbled- nibbled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could nibble
you could nibble
she could nibble
we could nibble
you could nibble
they could nibble 	I could be nibbling
you could be nibbling
she could be nibbling
we could be nibbling
you could be nibbling
they could be nibbling	I could have nibbled
you could have nibbled
she could have nibbled
we could have nibbled
you could have nibbled
they could have nibbled	I could have been nibbling
you could have been nibbling
she could have been nibbling
we could have been nibbling
you could have been nibbling
they could have been nibbling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't nibble
you couldn't nibble
she couldn't nibble
we couldn't nibble
you couldn't nibble
they couldn't nibble 	I couldn't be nibbling
you couldn't be nibbling
she couldn't be nibbling
we couldn't be nibbling
you couldn't be nibbling
they couldn't be nibbling	I couldn't have nibbled
you couldn't have nibbled
she couldn't have nibbled
we couldn't have nibbled
you couldn't have nibbled
they couldn't have nibbled	I couldn't have been nibbling
you couldn't have been nibbling
she couldn't have been nibbling
we couldn't have been nibbling
you couldn't have been nibbling
they couldn't have been nibbling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I nibble?
could you nibble?
could she nibble?
could we nibble?
could you nibble?
could they nibble? 	could I be nibbling?
could you be nibbling?
could she be nibbling?
could we be nibbling?
could you be nibbling?
could they be nibbling? 	could I have nibbled?
could you have nibbled?
could she have nibbled?
could we have nibbled?
could you have nibbled?
could they have nibbled? 	could I have been nibbling?
could you have been nibbling?
could she have been nibbling?
could we have been nibbling?
could you have been nibbling?
could they have been nibbling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I nibble?
couldn't you nibble?
couldn't she nibble?
couldn't we nibble?
couldn't you nibble?
couldn't they nibble? 	couldn't I be nibbling?
couldn't you be nibbling?
couldn't she be nibbling?
couldn't we be nibbling?
couldn't you be nibbling?
couldn't they be nibbling? 	couldn't I have nibbled?
couldn't you have nibbled?
couldn't she have nibbled?
couldn't we have nibbled?
couldn't you have nibbled?
couldn't they have nibbled? 	couldn't I have been nibbling?
couldn't you have been nibbling?
couldn't she have been nibbling?
couldn't we have been nibbling?
couldn't you have been nibbling?
couldn't they have been nibbling?