I could shovel you could shovel she could shovel we could shovel you could shovel they could shovel
V-ing form
I could be shovelling you could be shovelling she could be shovelling we could be shovelling you could be shovelling they could be shovelling
Perfect
I could have shovelled you could have shovelled she could have shovelled we could have shovelled you could have shovelled they could have shovelled
V-ing perfect
I could have been shovelling you could have been shovelling she could have been shovelling we could have been shovelling you could have been shovelling they could have been shovelling
Negation
Simple form
I could not shovel you could not shovel she could not shovel we could not shovel you could not shovel they could not shovel
V-ing form
I could not be shovelling you could not be shovelling she could not be shovelling we could not be shovelling you could not be shovelling they could not be shovelling
Perfect
I could not have shovelled you could not have shovelled she could not have shovelled we could not have shovelled you could not have shovelled they could not have shovelled
V-ing perfect
I could not have been shovelling you could not have been shovelling she could not have been shovelling we could not have been shovelling you could not have been shovelling they could not have been shovelling
Interrogative form
Simple form
could I shovel? could you shovel? could she shovel? could we shovel? could you shovel? could they shovel?
V-ing form
could I be shovelling? could you be shovelling? could she be shovelling? could we be shovelling? could you be shovelling? could they be shovelling?
Perfect
could I have shovelled? could you have shovelled? could she have shovelled? could we have shovelled? could you have shovelled? could they have shovelled?
V-ing perfect
could I have been shovelling? could you have been shovelling? could she have been shovelling? could we have been shovelling? could you have been shovelling? could they have been shovelling?
Interro-negative form
Simple form
could I not shovel? could you not shovel? could she not shovel? could we not shovel? could you not shovel? could they not shovel?
V-ing form
could I not be shovelling? could you not be shovelling? could she not be shovelling? could we not be shovelling? could you not be shovelling? could they not be shovelling?
Perfect
could I not have shovelled? could you not have shovelled? could she not have shovelled? could we not have shovelled? could you not have shovelled? could they not have shovelled?
V-ing perfect
could I not have been shovelling? could you not have been shovelling? could she not have been shovelling? could we not have been shovelling? could you not have been shovelling? could they not have been shovelling?