The root خ و ف and the سَمِعَ يَسْمَعُ class tie the entire chapter together.
CategoryFormMeaning
Active perfectخَافَHe feared
Passive perfectخِيفَHe/it was feared
Active imperfectيَخَافُHe fears
Passive imperfectيُخَافُHe/it is feared
Lamلَمْ يَخَفْHe did not fear
Lanلَنْ يَخَافَHe will not fear
Direct commandخَفْFear!
Prohibitionلَا تَخَفْDo not fear!
Active participleخَائِفٌOne who fears
Passive participleمَخُوفٌOne who is feared
Inflectional person, voice and governing particles distinguish these meanings without changing the underlying root.