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 couldn't shovel you couldn't shovel she couldn't shovel we couldn't shovel you couldn't shovel they couldn't shovel
V-ing form
I couldn't be shovelling you couldn't be shovelling she couldn't be shovelling we couldn't be shovelling you couldn't be shovelling they couldn't be shovelling
Perfect
I couldn't have shovelled you couldn't have shovelled she couldn't have shovelled we couldn't have shovelled you couldn't have shovelled they couldn't have shovelled
V-ing perfect
I couldn't have been shovelling you couldn't have been shovelling she couldn't have been shovelling we couldn't have been shovelling you couldn't have been shovelling they couldn't 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
couldn't I shovel? couldn't you shovel? couldn't she shovel? couldn't we shovel? couldn't you shovel? couldn't they shovel?
V-ing form
couldn't I be shovelling? couldn't you be shovelling? couldn't she be shovelling? couldn't we be shovelling? couldn't you be shovelling? couldn't they be shovelling?
Perfect
couldn't I have shovelled? couldn't you have shovelled? couldn't she have shovelled? couldn't we have shovelled? couldn't you have shovelled? couldn't they have shovelled?
V-ing perfect
couldn't I have been shovelling? couldn't you have been shovelling? couldn't she have been shovelling? couldn't we have been shovelling? couldn't you have been shovelling? couldn't they have been shovelling?