1. Find the verb. What action occurred?
2. Find the subject. Who performed the action?
3. Ask whether the meaning is complete. If not, look for the object.
4. Keep the object accusative. Check whether the form shows fatḥah, ياء, or the sound-feminine-plural kasrah.
5. Check whether the verb needs 1 or 2 objects.
Try it: فَتَحَ حَامِدٌ الْبَابَ — Hamid opened the door.