could guggle
Regular verb: guggle - guggled- guggled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could guggle
you could guggle
he could guggle
we could guggle
you could guggle
they could guggle 	I could be guggling
you could be guggling
he could be guggling
we could be guggling
you could be guggling
they could be guggling	I could have guggled
you could have guggled
he could have guggled
we could have guggled
you could have guggled
they could have guggled	I could have been guggling
you could have been guggling
he could have been guggling
we could have been guggling
you could have been guggling
they could have been guggling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't guggle
you couldn't guggle
he couldn't guggle
we couldn't guggle
you couldn't guggle
they couldn't guggle 	I couldn't be guggling
you couldn't be guggling
he couldn't be guggling
we couldn't be guggling
you couldn't be guggling
they couldn't be guggling	I couldn't have guggled
you couldn't have guggled
he couldn't have guggled
we couldn't have guggled
you couldn't have guggled
they couldn't have guggled	I couldn't have been guggling
you couldn't have been guggling
he couldn't have been guggling
we couldn't have been guggling
you couldn't have been guggling
they couldn't have been guggling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I guggle?
could you guggle?
could he guggle?
could we guggle?
could you guggle?
could they guggle? 	could I be guggling?
could you be guggling?
could he be guggling?
could we be guggling?
could you be guggling?
could they be guggling? 	could I have guggled?
could you have guggled?
could he have guggled?
could we have guggled?
could you have guggled?
could they have guggled? 	could I have been guggling?
could you have been guggling?
could he have been guggling?
could we have been guggling?
could you have been guggling?
could they have been guggling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I guggle?
couldn't you guggle?
couldn't he guggle?
couldn't we guggle?
couldn't you guggle?
couldn't they guggle? 	couldn't I be guggling?
couldn't you be guggling?
couldn't he be guggling?
couldn't we be guggling?
couldn't you be guggling?
couldn't they be guggling? 	couldn't I have guggled?
couldn't you have guggled?
couldn't he have guggled?
couldn't we have guggled?
couldn't you have guggled?
couldn't they have guggled? 	couldn't I have been guggling?
couldn't you have been guggling?
couldn't he have been guggling?
couldn't we have been guggling?
couldn't you have been guggling?
couldn't they have been guggling?