He replaces it with a substitute word. Republicanism is a system that replaces or accompanies inherited rule. Instead, a serine replaces the cysteine at this position. The enzyme effectively replaces a hydroxymethyl with a methyl. Sometimes, a country completely replaces the old currency with new currency. Selenium is found in , where it partially replaces the sulfur. Jihyo replaces Chaeyoung in the Majors lineup, sending her to Minors. To make such a formula, one simply replaces a number with a cell reference. Trinity replaces the "Vigilant" crew and completes their mission. It only replaces one hard problem with another. Later, he also replaces the school bus driver. Mimic then replaces Blink as leader, gaining the Tallus. Often a participle replaces an adverbial clause. She later replaces Morgana as the party's navigator. In other contexts, the present subjunctive form always replaces it.