could sneak
Irregular verb: sneak - sneaked, snuck- snuck

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sneak
you could sneak
he could sneak
we could sneak
you could sneak
they could sneak 	I could be sneaking
you could be sneaking
he could be sneaking
we could be sneaking
you could be sneaking
they could be sneaking	I could have snuck
you could have snuck
he could have snuck
we could have snuck
you could have snuck
they could have snuck	I could have been sneaking
you could have been sneaking
he could have been sneaking
we could have been sneaking
you could have been sneaking
they could have been sneaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sneak
you couldn't sneak
he couldn't sneak
we couldn't sneak
you couldn't sneak
they couldn't sneak 	I couldn't be sneaking
you couldn't be sneaking
he couldn't be sneaking
we couldn't be sneaking
you couldn't be sneaking
they couldn't be sneaking	I couldn't have snuck
you couldn't have snuck
he couldn't have snuck
we couldn't have snuck
you couldn't have snuck
they couldn't have snuck	I couldn't have been sneaking
you couldn't have been sneaking
he couldn't have been sneaking
we couldn't have been sneaking
you couldn't have been sneaking
they couldn't have been sneaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sneak?
could you sneak?
could he sneak?
could we sneak?
could you sneak?
could they sneak? 	could I be sneaking?
could you be sneaking?
could he be sneaking?
could we be sneaking?
could you be sneaking?
could they be sneaking? 	could I have snuck?
could you have snuck?
could he have snuck?
could we have snuck?
could you have snuck?
could they have snuck? 	could I have been sneaking?
could you have been sneaking?
could he have been sneaking?
could we have been sneaking?
could you have been sneaking?
could they have been sneaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sneak?
couldn't you sneak?
couldn't he sneak?
couldn't we sneak?
couldn't you sneak?
couldn't they sneak? 	couldn't I be sneaking?
couldn't you be sneaking?
couldn't he be sneaking?
couldn't we be sneaking?
couldn't you be sneaking?
couldn't they be sneaking? 	couldn't I have snuck?
couldn't you have snuck?
couldn't he have snuck?
couldn't we have snuck?
couldn't you have snuck?
couldn't they have snuck? 	couldn't I have been sneaking?
couldn't you have been sneaking?
couldn't he have been sneaking?
couldn't we have been sneaking?
couldn't you have been sneaking?
couldn't they have been sneaking?