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