I could article you could article he could article we could article you could article they could article
V-ing form
I could be articling you could be articling he could be articling we could be articling you could be articling they could be articling
Perfect
I could have articled you could have articled he 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 he 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 he 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 he 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 he 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 he 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 he article? could we article? could you article? could they article?
V-ing form
could I be articling? could you be articling? could he be articling? could we be articling? could you be articling? could they be articling?
Perfect
could I have articled? could you have articled? could he 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 he 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 he 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 he 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 he 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 he not have been articling? could we not have been articling? could you not have been articling? could they not have been articling?