Common spelling and grammar mistakes are often indicated with specific symbols. For example, “sp” in the margin indicates a spelling mistake, while “gr” indicates a grammar mistake. Other symbols, such as # (for a missing word) or [sic] (for a mistake that should be left as it is), are also used.

For misspelled words, write the letters 'sp' above or over the incorrectly-spelled word. You can also circle the word and write the letters 'sp. ' Other times, words are written in the wrong order.

A correction code is used to show learners what kind of mistakes they have made in written work. The teacher underlines each mistake and writes a symbol or an abbreviation next to it, showing the kind of mistake. 'We made our homework' - WW (wrong word).