The document contains a list of prefixes and their meanings provided by student Salma Abdullah of Grade 6E. It includes prefixes such as "un-", "dis-", "im-", "in-", "ir-", "il-", "anti-", "auto-", "bi-", "ex-", "micro-", "mis-", "mono-", "multi-", "over-", "under-", "pre-", "pro-", "pseudo-", "re-", "semi-", and "sub-". The prefixes are grouped categorically and include examples of words they can be attached to in order to modify or reverse their meaning. The student hopes that reviewing these common prefixes will help with vocabulary.