I could shoo you could shoo he could shoo we could shoo you could shoo they could shoo
V-ing form
I could be shooing you could be shooing he could be shooing we could be shooing you could be shooing they could be shooing
Perfect
I could have shooed you could have shooed he could have shooed we could have shooed you could have shooed they could have shooed
V-ing perfect
I could have been shooing you could have been shooing he could have been shooing we could have been shooing you could have been shooing they could have been shooing
Negation
Simple form
I couldn't shoo you couldn't shoo he couldn't shoo we couldn't shoo you couldn't shoo they couldn't shoo
V-ing form
I couldn't be shooing you couldn't be shooing he couldn't be shooing we couldn't be shooing you couldn't be shooing they couldn't be shooing
Perfect
I couldn't have shooed you couldn't have shooed he couldn't have shooed we couldn't have shooed you couldn't have shooed they couldn't have shooed
V-ing perfect
I couldn't have been shooing you couldn't have been shooing he couldn't have been shooing we couldn't have been shooing you couldn't have been shooing they couldn't have been shooing
Interrogative form
Simple form
could I shoo? could you shoo? could he shoo? could we shoo? could you shoo? could they shoo?
V-ing form
could I be shooing? could you be shooing? could he be shooing? could we be shooing? could you be shooing? could they be shooing?
Perfect
could I have shooed? could you have shooed? could he have shooed? could we have shooed? could you have shooed? could they have shooed?
V-ing perfect
could I have been shooing? could you have been shooing? could he have been shooing? could we have been shooing? could you have been shooing? could they have been shooing?
Interro-negative form
Simple form
couldn't I shoo? couldn't you shoo? couldn't he shoo? couldn't we shoo? couldn't you shoo? couldn't they shoo?
V-ing form
couldn't I be shooing? couldn't you be shooing? couldn't he be shooing? couldn't we be shooing? couldn't you be shooing? couldn't they be shooing?
Perfect
couldn't I have shooed? couldn't you have shooed? couldn't he have shooed? couldn't we have shooed? couldn't you have shooed? couldn't they have shooed?
V-ing perfect
couldn't I have been shooing? couldn't you have been shooing? couldn't he have been shooing? couldn't we have been shooing? couldn't you have been shooing? couldn't they have been shooing?