could sash
Regular verb: sash - sashed- sashed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sash
you could sash
he could sash
we could sash
you could sash
they could sash 	I could be sashing
you could be sashing
he could be sashing
we could be sashing
you could be sashing
they could be sashing	I could have sashed
you could have sashed
he could have sashed
we could have sashed
you could have sashed
they could have sashed	I could have been sashing
you could have been sashing
he could have been sashing
we could have been sashing
you could have been sashing
they could have been sashing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sash
you could not sash
he could not sash
we could not sash
you could not sash
they could not sash 	I could not be sashing
you could not be sashing
he could not be sashing
we could not be sashing
you could not be sashing
they could not be sashing	I could not have sashed
you could not have sashed
he could not have sashed
we could not have sashed
you could not have sashed
they could not have sashed	I could not have been sashing
you could not have been sashing
he could not have been sashing
we could not have been sashing
you could not have been sashing
they could not have been sashing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sash?
could you sash?
could he sash?
could we sash?
could you sash?
could they sash? 	could I be sashing?
could you be sashing?
could he be sashing?
could we be sashing?
could you be sashing?
could they be sashing? 	could I have sashed?
could you have sashed?
could he have sashed?
could we have sashed?
could you have sashed?
could they have sashed? 	could I have been sashing?
could you have been sashing?
could he have been sashing?
could we have been sashing?
could you have been sashing?
could they have been sashing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sash?
could you not sash?
could he not sash?
could we not sash?
could you not sash?
could they not sash? 	could I not be sashing?
could you not be sashing?
could he not be sashing?
could we not be sashing?
could you not be sashing?
could they not be sashing? 	could I not have sashed?
could you not have sashed?
could he not have sashed?
could we not have sashed?
could you not have sashed?
could they not have sashed? 	could I not have been sashing?
could you not have been sashing?
could he not have been sashing?
could we not have been sashing?
could you not have been sashing?
could they not have been sashing?