could swab
Verbo regular: swab - swabed- swabed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could swab
you could swab
he could swab
we could swab
you could swab
they could swab 	I could be swabing
you could be swabing
he could be swabing
we could be swabing
you could be swabing
they could be swabing	I could have swabed
you could have swabed
he could have swabed
we could have swabed
you could have swabed
they could have swabed	I could have been swabing
you could have been swabing
he could have been swabing
we could have been swabing
you could have been swabing
they could have been swabing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not swab
you could not swab
he could not swab
we could not swab
you could not swab
they could not swab 	I could not be swabing
you could not be swabing
he could not be swabing
we could not be swabing
you could not be swabing
they could not be swabing	I could not have swabed
you could not have swabed
he could not have swabed
we could not have swabed
you could not have swabed
they could not have swabed	I could not have been swabing
you could not have been swabing
he could not have been swabing
we could not have been swabing
you could not have been swabing
they could not have been swabing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I swab?
could you swab?
could he swab?
could we swab?
could you swab?
could they swab? 	could I be swabing?
could you be swabing?
could he be swabing?
could we be swabing?
could you be swabing?
could they be swabing? 	could I have swabed?
could you have swabed?
could he have swabed?
could we have swabed?
could you have swabed?
could they have swabed? 	could I have been swabing?
could you have been swabing?
could he have been swabing?
could we have been swabing?
could you have been swabing?
could they have been swabing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not swab?
could you not swab?
could he not swab?
could we not swab?
could you not swab?
could they not swab? 	could I not be swabing?
could you not be swabing?
could he not be swabing?
could we not be swabing?
could you not be swabing?
could they not be swabing? 	could I not have swabed?
could you not have swabed?
could he not have swabed?
could we not have swabed?
could you not have swabed?
could they not have swabed? 	could I not have been swabing?
could you not have been swabing?
could he not have been swabing?
could we not have been swabing?
could you not have been swabing?
could they not have been swabing?