could sizzle
Regular verb: sizzle - sizzled- sizzled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sizzle
you could sizzle
he could sizzle
we could sizzle
you could sizzle
they could sizzle 	I could be sizzling
you could be sizzling
he could be sizzling
we could be sizzling
you could be sizzling
they could be sizzling	I could have sizzled
you could have sizzled
he could have sizzled
we could have sizzled
you could have sizzled
they could have sizzled	I could have been sizzling
you could have been sizzling
he could have been sizzling
we could have been sizzling
you could have been sizzling
they could have been sizzling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sizzle
you couldn't sizzle
he couldn't sizzle
we couldn't sizzle
you couldn't sizzle
they couldn't sizzle 	I couldn't be sizzling
you couldn't be sizzling
he couldn't be sizzling
we couldn't be sizzling
you couldn't be sizzling
they couldn't be sizzling	I couldn't have sizzled
you couldn't have sizzled
he couldn't have sizzled
we couldn't have sizzled
you couldn't have sizzled
they couldn't have sizzled	I couldn't have been sizzling
you couldn't have been sizzling
he couldn't have been sizzling
we couldn't have been sizzling
you couldn't have been sizzling
they couldn't have been sizzling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sizzle?
could you sizzle?
could he sizzle?
could we sizzle?
could you sizzle?
could they sizzle? 	could I be sizzling?
could you be sizzling?
could he be sizzling?
could we be sizzling?
could you be sizzling?
could they be sizzling? 	could I have sizzled?
could you have sizzled?
could he have sizzled?
could we have sizzled?
could you have sizzled?
could they have sizzled? 	could I have been sizzling?
could you have been sizzling?
could he have been sizzling?
could we have been sizzling?
could you have been sizzling?
could they have been sizzling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sizzle?
couldn't you sizzle?
couldn't he sizzle?
couldn't we sizzle?
couldn't you sizzle?
couldn't they sizzle? 	couldn't I be sizzling?
couldn't you be sizzling?
couldn't he be sizzling?
couldn't we be sizzling?
couldn't you be sizzling?
couldn't they be sizzling? 	couldn't I have sizzled?
couldn't you have sizzled?
couldn't he have sizzled?
couldn't we have sizzled?
couldn't you have sizzled?
couldn't they have sizzled? 	couldn't I have been sizzling?
couldn't you have been sizzling?
couldn't he have been sizzling?
couldn't we have been sizzling?
couldn't you have been sizzling?
couldn't they have been sizzling?