I could tap-dance you could tap-dance she could tap-dance we could tap-dance you could tap-dance they could tap-dance
V-ing form
I could be tap-dancing you could be tap-dancing she could be tap-dancing we could be tap-dancing you could be tap-dancing they could be tap-dancing
Perfect
I could have tap-danced you could have tap-danced she could have tap-danced we could have tap-danced you could have tap-danced they could have tap-danced
V-ing perfect
I could have been tap-dancing you could have been tap-dancing she could have been tap-dancing we could have been tap-dancing you could have been tap-dancing they could have been tap-dancing
Negation
Simple form
I could not tap-dance you could not tap-dance she could not tap-dance we could not tap-dance you could not tap-dance they could not tap-dance
V-ing form
I could not be tap-dancing you could not be tap-dancing she could not be tap-dancing we could not be tap-dancing you could not be tap-dancing they could not be tap-dancing
Perfect
I could not have tap-danced you could not have tap-danced she could not have tap-danced we could not have tap-danced you could not have tap-danced they could not have tap-danced
V-ing perfect
I could not have been tap-dancing you could not have been tap-dancing she could not have been tap-dancing we could not have been tap-dancing you could not have been tap-dancing they could not have been tap-dancing
Interrogative form
Simple form
could I tap-dance? could you tap-dance? could she tap-dance? could we tap-dance? could you tap-dance? could they tap-dance?
V-ing form
could I be tap-dancing? could you be tap-dancing? could she be tap-dancing? could we be tap-dancing? could you be tap-dancing? could they be tap-dancing?
Perfect
could I have tap-danced? could you have tap-danced? could she have tap-danced? could we have tap-danced? could you have tap-danced? could they have tap-danced?
V-ing perfect
could I have been tap-dancing? could you have been tap-dancing? could she have been tap-dancing? could we have been tap-dancing? could you have been tap-dancing? could they have been tap-dancing?
Interro-negative form
Simple form
could I not tap-dance? could you not tap-dance? could she not tap-dance? could we not tap-dance? could you not tap-dance? could they not tap-dance?
V-ing form
could I not be tap-dancing? could you not be tap-dancing? could she not be tap-dancing? could we not be tap-dancing? could you not be tap-dancing? could they not be tap-dancing?
Perfect
could I not have tap-danced? could you not have tap-danced? could she not have tap-danced? could we not have tap-danced? could you not have tap-danced? could they not have tap-danced?
V-ing perfect
could I not have been tap-dancing? could you not have been tap-dancing? could she not have been tap-dancing? could we not have been tap-dancing? could you not have been tap-dancing? could they not have been tap-dancing?