could mangle
Regular verb: mangle - mangled- mangled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mangle
you could mangle
he could mangle
we could mangle
you could mangle
they could mangle 	I could be mangling
you could be mangling
he could be mangling
we could be mangling
you could be mangling
they could be mangling	I could have mangled
you could have mangled
he could have mangled
we could have mangled
you could have mangled
they could have mangled	I could have been mangling
you could have been mangling
he could have been mangling
we could have been mangling
you could have been mangling
they could have been mangling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't mangle
you couldn't mangle
he couldn't mangle
we couldn't mangle
you couldn't mangle
they couldn't mangle 	I couldn't be mangling
you couldn't be mangling
he couldn't be mangling
we couldn't be mangling
you couldn't be mangling
they couldn't be mangling	I couldn't have mangled
you couldn't have mangled
he couldn't have mangled
we couldn't have mangled
you couldn't have mangled
they couldn't have mangled	I couldn't have been mangling
you couldn't have been mangling
he couldn't have been mangling
we couldn't have been mangling
you couldn't have been mangling
they couldn't have been mangling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mangle?
could you mangle?
could he mangle?
could we mangle?
could you mangle?
could they mangle? 	could I be mangling?
could you be mangling?
could he be mangling?
could we be mangling?
could you be mangling?
could they be mangling? 	could I have mangled?
could you have mangled?
could he have mangled?
could we have mangled?
could you have mangled?
could they have mangled? 	could I have been mangling?
could you have been mangling?
could he have been mangling?
could we have been mangling?
could you have been mangling?
could they have been mangling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I mangle?
couldn't you mangle?
couldn't he mangle?
couldn't we mangle?
couldn't you mangle?
couldn't they mangle? 	couldn't I be mangling?
couldn't you be mangling?
couldn't he be mangling?
couldn't we be mangling?
couldn't you be mangling?
couldn't they be mangling? 	couldn't I have mangled?
couldn't you have mangled?
couldn't he have mangled?
couldn't we have mangled?
couldn't you have mangled?
couldn't they have mangled? 	couldn't I have been mangling?
couldn't you have been mangling?
couldn't he have been mangling?
couldn't we have been mangling?
couldn't you have been mangling?
couldn't they have been mangling?