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 couldn't article you couldn't article he couldn't article we couldn't article you couldn't article they couldn't article
V-ing form
I couldn't be articling you couldn't be articling he couldn't be articling we couldn't be articling you couldn't be articling they couldn't be articling
Perfect
I couldn't have articled you couldn't have articled he couldn't have articled we couldn't have articled you couldn't have articled they couldn't have articled
V-ing perfect
I couldn't have been articling you couldn't have been articling he couldn't have been articling we couldn't have been articling you couldn't have been articling they couldn't 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
couldn't I article? couldn't you article? couldn't he article? couldn't we article? couldn't you article? couldn't they article?
V-ing form
couldn't I be articling? couldn't you be articling? couldn't he be articling? couldn't we be articling? couldn't you be articling? couldn't they be articling?
Perfect
couldn't I have articled? couldn't you have articled? couldn't he have articled? couldn't we have articled? couldn't you have articled? couldn't they have articled?
V-ing perfect
couldn't I have been articling? couldn't you have been articling? couldn't he have been articling? couldn't we have been articling? couldn't you have been articling? couldn't they have been articling?