I could distill you could distill he could distill we could distill you could distill they could distill
V-ing form
I could be distilling you could be distilling he could be distilling we could be distilling you could be distilling they could be distilling
Perfect
I could have distilled you could have distilled he could have distilled we could have distilled you could have distilled they could have distilled
V-ing perfect
I could have been distilling you could have been distilling he could have been distilling we could have been distilling you could have been distilling they could have been distilling
Negation
Simple form
I could not distill you could not distill he could not distill we could not distill you could not distill they could not distill
V-ing form
I could not be distilling you could not be distilling he could not be distilling we could not be distilling you could not be distilling they could not be distilling
Perfect
I could not have distilled you could not have distilled he could not have distilled we could not have distilled you could not have distilled they could not have distilled
V-ing perfect
I could not have been distilling you could not have been distilling he could not have been distilling we could not have been distilling you could not have been distilling they could not have been distilling
Interrogative form
Simple form
could I distill? could you distill? could he distill? could we distill? could you distill? could they distill?
V-ing form
could I be distilling? could you be distilling? could he be distilling? could we be distilling? could you be distilling? could they be distilling?
Perfect
could I have distilled? could you have distilled? could he have distilled? could we have distilled? could you have distilled? could they have distilled?
V-ing perfect
could I have been distilling? could you have been distilling? could he have been distilling? could we have been distilling? could you have been distilling? could they have been distilling?
Interro-negative form
Simple form
could I not distill? could you not distill? could he not distill? could we not distill? could you not distill? could they not distill?
V-ing form
could I not be distilling? could you not be distilling? could he not be distilling? could we not be distilling? could you not be distilling? could they not be distilling?
Perfect
could I not have distilled? could you not have distilled? could he not have distilled? could we not have distilled? could you not have distilled? could they not have distilled?
V-ing perfect
could I not have been distilling? could you not have been distilling? could he not have been distilling? could we not have been distilling? could you not have been distilling? could they not have been distilling?