could gargle
Regular verb: gargle - gargled- gargled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could gargle
you could gargle
he could gargle
we could gargle
you could gargle
they could gargle 	I could be gargling
you could be gargling
he could be gargling
we could be gargling
you could be gargling
they could be gargling	I could have gargled
you could have gargled
he could have gargled
we could have gargled
you could have gargled
they could have gargled	I could have been gargling
you could have been gargling
he could have been gargling
we could have been gargling
you could have been gargling
they could have been gargling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't gargle
you couldn't gargle
he couldn't gargle
we couldn't gargle
you couldn't gargle
they couldn't gargle 	I couldn't be gargling
you couldn't be gargling
he couldn't be gargling
we couldn't be gargling
you couldn't be gargling
they couldn't be gargling	I couldn't have gargled
you couldn't have gargled
he couldn't have gargled
we couldn't have gargled
you couldn't have gargled
they couldn't have gargled	I couldn't have been gargling
you couldn't have been gargling
he couldn't have been gargling
we couldn't have been gargling
you couldn't have been gargling
they couldn't have been gargling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I gargle?
could you gargle?
could he gargle?
could we gargle?
could you gargle?
could they gargle? 	could I be gargling?
could you be gargling?
could he be gargling?
could we be gargling?
could you be gargling?
could they be gargling? 	could I have gargled?
could you have gargled?
could he have gargled?
could we have gargled?
could you have gargled?
could they have gargled? 	could I have been gargling?
could you have been gargling?
could he have been gargling?
could we have been gargling?
could you have been gargling?
could they have been gargling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I gargle?
couldn't you gargle?
couldn't he gargle?
couldn't we gargle?
couldn't you gargle?
couldn't they gargle? 	couldn't I be gargling?
couldn't you be gargling?
couldn't he be gargling?
couldn't we be gargling?
couldn't you be gargling?
couldn't they be gargling? 	couldn't I have gargled?
couldn't you have gargled?
couldn't he have gargled?
couldn't we have gargled?
couldn't you have gargled?
couldn't they have gargled? 	couldn't I have been gargling?
couldn't you have been gargling?
couldn't he have been gargling?
couldn't we have been gargling?
couldn't you have been gargling?
couldn't they have been gargling?