THERE= a place. not here - THEIR= belongs to them - THEY'RE = short for "They Are". THEN = a point in time; not now. - THAN = used to compare things.
Something AFFECTS you. You have an EFFECT on something. If something is LOOSE you might LOSE it. Your=belongs to "you" You're short for "you are"
Dual=2 Duel=fight. If two sets of twin brothers have a gunfight, you have a Dual Duel. MUTE=Silent, unable to talk. MOOT= No longer relevant or important. "A mute points out a moot point."