could oscillate
Verbo regular: oscillate - oscillated- oscillated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could oscillate
you could oscillate
he could oscillate
we could oscillate
you could oscillate
they could oscillate 	I could be oscillating
you could be oscillating
he could be oscillating
we could be oscillating
you could be oscillating
they could be oscillating	I could have oscillated
you could have oscillated
he could have oscillated
we could have oscillated
you could have oscillated
they could have oscillated	I could have been oscillating
you could have been oscillating
he could have been oscillating
we could have been oscillating
you could have been oscillating
they could have been oscillating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not oscillate
you could not oscillate
he could not oscillate
we could not oscillate
you could not oscillate
they could not oscillate 	I could not be oscillating
you could not be oscillating
he could not be oscillating
we could not be oscillating
you could not be oscillating
they could not be oscillating	I could not have oscillated
you could not have oscillated
he could not have oscillated
we could not have oscillated
you could not have oscillated
they could not have oscillated	I could not have been oscillating
you could not have been oscillating
he could not have been oscillating
we could not have been oscillating
you could not have been oscillating
they could not have been oscillating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I oscillate?
could you oscillate?
could he oscillate?
could we oscillate?
could you oscillate?
could they oscillate? 	could I be oscillating?
could you be oscillating?
could he be oscillating?
could we be oscillating?
could you be oscillating?
could they be oscillating? 	could I have oscillated?
could you have oscillated?
could he have oscillated?
could we have oscillated?
could you have oscillated?
could they have oscillated? 	could I have been oscillating?
could you have been oscillating?
could he have been oscillating?
could we have been oscillating?
could you have been oscillating?
could they have been oscillating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not oscillate?
could you not oscillate?
could he not oscillate?
could we not oscillate?
could you not oscillate?
could they not oscillate? 	could I not be oscillating?
could you not be oscillating?
could he not be oscillating?
could we not be oscillating?
could you not be oscillating?
could they not be oscillating? 	could I not have oscillated?
could you not have oscillated?
could he not have oscillated?
could we not have oscillated?
could you not have oscillated?
could they not have oscillated? 	could I not have been oscillating?
could you not have been oscillating?
could he not have been oscillating?
could we not have been oscillating?
could you not have been oscillating?
could they not have been oscillating?