Most often, the /f/ sound in the initial, final, and medial positions is made by the consonant f as it is represented in words such as fat, if, and often. The use of the consonant f is very consistent for it only makes this one sound. However, when f is doubled, as in off, one f is silent. The sound /f/ is also represented by the digraphs ph, as in phone and graph, and gh as in enough and rough. Children may be confused by the silent gh in a word like fight.