The phonics rule for the digraph “ph” is that it represents the sound of “f”: Here are some other things to know about the “ph” digraph: Greek origin Most English words with “ph” are of Greek origin and are often longer and more complex. Word length Words with two or more syllables usually use “ph”, while shorter words usually use “f”. Examples Some examples of words with “ph” include “nephew”, “phone”, “photograph”, “alphabet”, “sphere”, “dolphin”, “graph”, “philosophy”, “microphone”, and “trop