"E" (added to answers to questions) and "o" (for statements) are used for exclamations and are added to the front only. "Pa" (meaning "not yet", "not yet done", "to continue", or "still") and "na" (meaning "now", "already", or "already done") can be placed in the middle or end. "Naman" (same as "na" but mostly for emphasis only) is placed anywhere.