could swish
Regular verb: swish - swished- swished

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could swish
you could swish
he could swish
we could swish
you could swish
they could swish 	I could be swishing
you could be swishing
he could be swishing
we could be swishing
you could be swishing
they could be swishing	I could have swished
you could have swished
he could have swished
we could have swished
you could have swished
they could have swished	I could have been swishing
you could have been swishing
he could have been swishing
we could have been swishing
you could have been swishing
they could have been swishing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't swish
you couldn't swish
he couldn't swish
we couldn't swish
you couldn't swish
they couldn't swish 	I couldn't be swishing
you couldn't be swishing
he couldn't be swishing
we couldn't be swishing
you couldn't be swishing
they couldn't be swishing	I couldn't have swished
you couldn't have swished
he couldn't have swished
we couldn't have swished
you couldn't have swished
they couldn't have swished	I couldn't have been swishing
you couldn't have been swishing
he couldn't have been swishing
we couldn't have been swishing
you couldn't have been swishing
they couldn't have been swishing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I swish?
could you swish?
could he swish?
could we swish?
could you swish?
could they swish? 	could I be swishing?
could you be swishing?
could he be swishing?
could we be swishing?
could you be swishing?
could they be swishing? 	could I have swished?
could you have swished?
could he have swished?
could we have swished?
could you have swished?
could they have swished? 	could I have been swishing?
could you have been swishing?
could he have been swishing?
could we have been swishing?
could you have been swishing?
could they have been swishing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I swish?
couldn't you swish?
couldn't he swish?
couldn't we swish?
couldn't you swish?
couldn't they swish? 	couldn't I be swishing?
couldn't you be swishing?
couldn't he be swishing?
couldn't we be swishing?
couldn't you be swishing?
couldn't they be swishing? 	couldn't I have swished?
couldn't you have swished?
couldn't he have swished?
couldn't we have swished?
couldn't you have swished?
couldn't they have swished? 	couldn't I have been swishing?
couldn't you have been swishing?
couldn't he have been swishing?
couldn't we have been swishing?
couldn't you have been swishing?
couldn't they have been swishing?