I could article you could article she could article we could article you could article they could article
V-ing form
I could be articling you could be articling she could be articling we could be articling you could be articling they could be articling
Perfect
I could have articled you could have articled she could have articled we could have articled you could have articled they could have articled
V-ing perfect
I could have been articling you could have been articling she could have been articling we could have been articling you could have been articling they could have been articling
Negation
Simple form
I could not article you could not article she could not article we could not article you could not article they could not article
V-ing form
I could not be articling you could not be articling she could not be articling we could not be articling you could not be articling they could not be articling
Perfect
I could not have articled you could not have articled she could not have articled we could not have articled you could not have articled they could not have articled
V-ing perfect
I could not have been articling you could not have been articling she could not have been articling we could not have been articling you could not have been articling they could not have been articling
Interrogative form
Simple form
could I article? could you article? could she article? could we article? could you article? could they article?
V-ing form
could I be articling? could you be articling? could she be articling? could we be articling? could you be articling? could they be articling?
Perfect
could I have articled? could you have articled? could she have articled? could we have articled? could you have articled? could they have articled?
V-ing perfect
could I have been articling? could you have been articling? could she have been articling? could we have been articling? could you have been articling? could they have been articling?
Interro-negative form
Simple form
could I not article? could you not article? could she not article? could we not article? could you not article? could they not article?
V-ing form
could I not be articling? could you not be articling? could she not be articling? could we not be articling? could you not be articling? could they not be articling?
Perfect
could I not have articled? could you not have articled? could she not have articled? could we not have articled? could you not have articled? could they not have articled?
V-ing perfect
could I not have been articling? could you not have been articling? could she not have been articling? could we not have been articling? could you not have been articling? could they not have been articling?