I could waggle you could waggle he could waggle we could waggle you could waggle they could waggle
V-ing form
I could be waggling you could be waggling he could be waggling we could be waggling you could be waggling they could be waggling
Perfect
I could have waggled you could have waggled he could have waggled we could have waggled you could have waggled they could have waggled
V-ing perfect
I could have been waggling you could have been waggling he could have been waggling we could have been waggling you could have been waggling they could have been waggling
Negation
Simple form
I could not waggle you could not waggle he could not waggle we could not waggle you could not waggle they could not waggle
V-ing form
I could not be waggling you could not be waggling he could not be waggling we could not be waggling you could not be waggling they could not be waggling
Perfect
I could not have waggled you could not have waggled he could not have waggled we could not have waggled you could not have waggled they could not have waggled
V-ing perfect
I could not have been waggling you could not have been waggling he could not have been waggling we could not have been waggling you could not have been waggling they could not have been waggling
Interrogative form
Simple form
could I waggle? could you waggle? could he waggle? could we waggle? could you waggle? could they waggle?
V-ing form
could I be waggling? could you be waggling? could he be waggling? could we be waggling? could you be waggling? could they be waggling?
Perfect
could I have waggled? could you have waggled? could he have waggled? could we have waggled? could you have waggled? could they have waggled?
V-ing perfect
could I have been waggling? could you have been waggling? could he have been waggling? could we have been waggling? could you have been waggling? could they have been waggling?
Interro-negative form
Simple form
could I not waggle? could you not waggle? could he not waggle? could we not waggle? could you not waggle? could they not waggle?
V-ing form
could I not be waggling? could you not be waggling? could he not be waggling? could we not be waggling? could you not be waggling? could they not be waggling?
Perfect
could I not have waggled? could you not have waggled? could he not have waggled? could we not have waggled? could you not have waggled? could they not have waggled?
V-ing perfect
could I not have been waggling? could you not have been waggling? could he not have been waggling? could we not have been waggling? could you not have been waggling? could they not have been waggling?