This document provides clarification on some commonly confused words:
- Who is used as a subject while whom is used as an object.
- That is used in essential phrases and which is used in non-essential phrases.
- Between is used for two items or people and among is used for three or more.
- Compose means to make up while comprise means to include.
- Affect is usually used as a verb meaning to influence, while effect is usually used as a noun meaning a result.