could waddle
Regular verb: waddle - waddled- waddled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could waddle
you could waddle
she could waddle
we could waddle
you could waddle
they could waddle 	I could be waddling
you could be waddling
she could be waddling
we could be waddling
you could be waddling
they could be waddling	I could have waddled
you could have waddled
she could have waddled
we could have waddled
you could have waddled
they could have waddled	I could have been waddling
you could have been waddling
she could have been waddling
we could have been waddling
you could have been waddling
they could have been waddling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't waddle
you couldn't waddle
she couldn't waddle
we couldn't waddle
you couldn't waddle
they couldn't waddle 	I couldn't be waddling
you couldn't be waddling
she couldn't be waddling
we couldn't be waddling
you couldn't be waddling
they couldn't be waddling	I couldn't have waddled
you couldn't have waddled
she couldn't have waddled
we couldn't have waddled
you couldn't have waddled
they couldn't have waddled	I couldn't have been waddling
you couldn't have been waddling
she couldn't have been waddling
we couldn't have been waddling
you couldn't have been waddling
they couldn't have been waddling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I waddle?
could you waddle?
could she waddle?
could we waddle?
could you waddle?
could they waddle? 	could I be waddling?
could you be waddling?
could she be waddling?
could we be waddling?
could you be waddling?
could they be waddling? 	could I have waddled?
could you have waddled?
could she have waddled?
could we have waddled?
could you have waddled?
could they have waddled? 	could I have been waddling?
could you have been waddling?
could she have been waddling?
could we have been waddling?
could you have been waddling?
could they have been waddling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I waddle?
couldn't you waddle?
couldn't she waddle?
couldn't we waddle?
couldn't you waddle?
couldn't they waddle? 	couldn't I be waddling?
couldn't you be waddling?
couldn't she be waddling?
couldn't we be waddling?
couldn't you be waddling?
couldn't they be waddling? 	couldn't I have waddled?
couldn't you have waddled?
couldn't she have waddled?
couldn't we have waddled?
couldn't you have waddled?
couldn't they have waddled? 	couldn't I have been waddling?
couldn't you have been waddling?
couldn't she have been waddling?
couldn't we have been waddling?
couldn't you have been waddling?
couldn't they have been waddling?