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