could yarn
Verbo regular: yarn - yarned- yarned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could yarn
you could yarn
she could yarn
we could yarn
you could yarn
they could yarn 	I could be yarning
you could be yarning
she could be yarning
we could be yarning
you could be yarning
they could be yarning	I could have yarned
you could have yarned
she could have yarned
we could have yarned
you could have yarned
they could have yarned	I could have been yarning
you could have been yarning
she could have been yarning
we could have been yarning
you could have been yarning
they could have been yarning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not yarn
you could not yarn
she could not yarn
we could not yarn
you could not yarn
they could not yarn 	I could not be yarning
you could not be yarning
she could not be yarning
we could not be yarning
you could not be yarning
they could not be yarning	I could not have yarned
you could not have yarned
she could not have yarned
we could not have yarned
you could not have yarned
they could not have yarned	I could not have been yarning
you could not have been yarning
she could not have been yarning
we could not have been yarning
you could not have been yarning
they could not have been yarning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I yarn?
could you yarn?
could she yarn?
could we yarn?
could you yarn?
could they yarn? 	could I be yarning?
could you be yarning?
could she be yarning?
could we be yarning?
could you be yarning?
could they be yarning? 	could I have yarned?
could you have yarned?
could she have yarned?
could we have yarned?
could you have yarned?
could they have yarned? 	could I have been yarning?
could you have been yarning?
could she have been yarning?
could we have been yarning?
could you have been yarning?
could they have been yarning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not yarn?
could you not yarn?
could she not yarn?
could we not yarn?
could you not yarn?
could they not yarn? 	could I not be yarning?
could you not be yarning?
could she not be yarning?
could we not be yarning?
could you not be yarning?
could they not be yarning? 	could I not have yarned?
could you not have yarned?
could she not have yarned?
could we not have yarned?
could you not have yarned?
could they not have yarned? 	could I not have been yarning?
could you not have been yarning?
could she not have been yarning?
could we not have been yarning?
could you not have been yarning?
could they not have been yarning?