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