could grummet
Regular verb: grummet - grummeted- grummeted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could grummet
you could grummet
he could grummet
we could grummet
you could grummet
they could grummet 	I could be grummeting
you could be grummeting
he could be grummeting
we could be grummeting
you could be grummeting
they could be grummeting	I could have grummeted
you could have grummeted
he could have grummeted
we could have grummeted
you could have grummeted
they could have grummeted	I could have been grummeting
you could have been grummeting
he could have been grummeting
we could have been grummeting
you could have been grummeting
they could have been grummeting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't grummet
you couldn't grummet
he couldn't grummet
we couldn't grummet
you couldn't grummet
they couldn't grummet 	I couldn't be grummeting
you couldn't be grummeting
he couldn't be grummeting
we couldn't be grummeting
you couldn't be grummeting
they couldn't be grummeting	I couldn't have grummeted
you couldn't have grummeted
he couldn't have grummeted
we couldn't have grummeted
you couldn't have grummeted
they couldn't have grummeted	I couldn't have been grummeting
you couldn't have been grummeting
he couldn't have been grummeting
we couldn't have been grummeting
you couldn't have been grummeting
they couldn't have been grummeting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I grummet?
could you grummet?
could he grummet?
could we grummet?
could you grummet?
could they grummet? 	could I be grummeting?
could you be grummeting?
could he be grummeting?
could we be grummeting?
could you be grummeting?
could they be grummeting? 	could I have grummeted?
could you have grummeted?
could he have grummeted?
could we have grummeted?
could you have grummeted?
could they have grummeted? 	could I have been grummeting?
could you have been grummeting?
could he have been grummeting?
could we have been grummeting?
could you have been grummeting?
could they have been grummeting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I grummet?
couldn't you grummet?
couldn't he grummet?
couldn't we grummet?
couldn't you grummet?
couldn't they grummet? 	couldn't I be grummeting?
couldn't you be grummeting?
couldn't he be grummeting?
couldn't we be grummeting?
couldn't you be grummeting?
couldn't they be grummeting? 	couldn't I have grummeted?
couldn't you have grummeted?
couldn't he have grummeted?
couldn't we have grummeted?
couldn't you have grummeted?
couldn't they have grummeted? 	couldn't I have been grummeting?
couldn't you have been grummeting?
couldn't he have been grummeting?
couldn't we have been grummeting?
couldn't you have been grummeting?
couldn't they have been grummeting?