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 couldn't waggle you couldn't waggle he couldn't waggle we couldn't waggle you couldn't waggle they couldn't waggle
V-ing form
I couldn't be waggling you couldn't be waggling he couldn't be waggling we couldn't be waggling you couldn't be waggling they couldn't be waggling
Perfect
I couldn't have waggled you couldn't have waggled he couldn't have waggled we couldn't have waggled you couldn't have waggled they couldn't have waggled
V-ing perfect
I couldn't have been waggling you couldn't have been waggling he couldn't have been waggling we couldn't have been waggling you couldn't have been waggling they couldn't 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
couldn't I waggle? couldn't you waggle? couldn't he waggle? couldn't we waggle? couldn't you waggle? couldn't they waggle?
V-ing form
couldn't I be waggling? couldn't you be waggling? couldn't he be waggling? couldn't we be waggling? couldn't you be waggling? couldn't they be waggling?
Perfect
couldn't I have waggled? couldn't you have waggled? couldn't he have waggled? couldn't we have waggled? couldn't you have waggled? couldn't they have waggled?
V-ing perfect
couldn't I have been waggling? couldn't you have been waggling? couldn't he have been waggling? couldn't we have been waggling? couldn't you have been waggling? couldn't they have been waggling?