Answer:
イ+口 Katakana "I" or The "Ninben" radical - person / KOU, kuchi - mouth
戒 KAI, imashi(meru) - admonish, warn
幾 KI, iku - how much, how many, some
口 KOU, kuchi - mouth
夂 The "Nomata" radical - to follow
Adding a tree (木 MOKU, BOKU, ki - tree) to these characters lets them branch out in a new direction!
保 HO, BU, tamo(tsu) - keep, preserve, maintain
械 KAI - machine
機 KI, hata - opportunity, loom, machine
困 KON, koma(ru) - be distressed, trouble
条 JOU - article, clause, line, stripe