3.Spelling

English is said to have one of the most difficult spelling systems in the world. The written representation of English is not phonetically exact for two main reasons. First, the spelling of words has changed to a lesser extent than their sounds; for example, the k in knife and the gh in right were formerly pronounced (see Middle English Period below). Second, certain spelling conventions acquired from foreign sources have been perpetuated; for example, during the 16th century the b was inserted in doubt (formerly spelled doute) on the authority of dubitare, the Latin source of the word. Outstanding examples of discrepancies between spelling and pronunciation are the six different pronunciations of ough, as in bough, cough, thorough, thought, through, and rough; the spellings are kept from a time when the gh represented a back fricative consonant that was pronounced in these words. Other obvious discrepancies are the 14 different spellings of the sh sound, for example, as in anxious, fission, fuchsia, and ocean.