I could boo-hoo you could boo-hoo she could boo-hoo we could boo-hoo you could boo-hoo they could boo-hoo
V-ing form
I could be boo-hooing you could be boo-hooing she could be boo-hooing we could be boo-hooing you could be boo-hooing they could be boo-hooing
Perfect
I could have boo-hooed you could have boo-hooed she could have boo-hooed we could have boo-hooed you could have boo-hooed they could have boo-hooed
V-ing perfect
I could have been boo-hooing you could have been boo-hooing she could have been boo-hooing we could have been boo-hooing you could have been boo-hooing they could have been boo-hooing
Negation
Simple form
I couldn't boo-hoo you couldn't boo-hoo she couldn't boo-hoo we couldn't boo-hoo you couldn't boo-hoo they couldn't boo-hoo
V-ing form
I couldn't be boo-hooing you couldn't be boo-hooing she couldn't be boo-hooing we couldn't be boo-hooing you couldn't be boo-hooing they couldn't be boo-hooing
Perfect
I couldn't have boo-hooed you couldn't have boo-hooed she couldn't have boo-hooed we couldn't have boo-hooed you couldn't have boo-hooed they couldn't have boo-hooed
V-ing perfect
I couldn't have been boo-hooing you couldn't have been boo-hooing she couldn't have been boo-hooing we couldn't have been boo-hooing you couldn't have been boo-hooing they couldn't have been boo-hooing
Interrogative form
Simple form
could I boo-hoo? could you boo-hoo? could she boo-hoo? could we boo-hoo? could you boo-hoo? could they boo-hoo?
V-ing form
could I be boo-hooing? could you be boo-hooing? could she be boo-hooing? could we be boo-hooing? could you be boo-hooing? could they be boo-hooing?
Perfect
could I have boo-hooed? could you have boo-hooed? could she have boo-hooed? could we have boo-hooed? could you have boo-hooed? could they have boo-hooed?
V-ing perfect
could I have been boo-hooing? could you have been boo-hooing? could she have been boo-hooing? could we have been boo-hooing? could you have been boo-hooing? could they have been boo-hooing?
Interro-negative form
Simple form
couldn't I boo-hoo? couldn't you boo-hoo? couldn't she boo-hoo? couldn't we boo-hoo? couldn't you boo-hoo? couldn't they boo-hoo?
V-ing form
couldn't I be boo-hooing? couldn't you be boo-hooing? couldn't she be boo-hooing? couldn't we be boo-hooing? couldn't you be boo-hooing? couldn't they be boo-hooing?
Perfect
couldn't I have boo-hooed? couldn't you have boo-hooed? couldn't she have boo-hooed? couldn't we have boo-hooed? couldn't you have boo-hooed? couldn't they have boo-hooed?
V-ing perfect
couldn't I have been boo-hooing? couldn't you have been boo-hooing? couldn't she have been boo-hooing? couldn't we have been boo-hooing? couldn't you have been boo-hooing? couldn't they have been boo-hooing?