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