Πρόσωπα + am/is/are + ρήμα-ing
I am reading. / You-We-They are reading. / He-She-It is reading.
Άρνηση: I am not reading. He is not reading.
Ερώτηση: Am I reading? Is he reading? Are they reading?
Παράδειγμα: the dog / sleep? ✓ → Is the dog sleeping? + Yes, it is.