Pinyin "zheng4"

正 = 一 + 止 : Mnemonic symbol: a stick-figure with straight lines. James II of England (zh) really has to use the engine's bathroom ((e)ng4), but there's a stick-figure (正) blocking the stalls with a barrier (止). The stick-figure measures with a flute (一) whether James is tall enough to go. James stands very straight (正) to make himself as tall as possible.

政 = 攵 + 正 : As James II of England (zh) became a powerful politician (政) he used his power for many crazy laws. For example, he once ordered a stick figure (正) to tear down the engine's bathroom ((e)ng4) using a sledgehammer (攵).

郑 = 关 + 阝 : James II of England (zh) and Zheng He (郑) agreed to build a pipeline (郑) connecting their nations, but it runs through the engine's bathroom ((e)ng4). The emperor (阝) is very annoyed by the pipeline and every time he visits the bathroom he'll push its off button (关).

证 = 正 + 讠 : James II of England (zh) is not allowed to stay any longer in the engine, so in the bathroom ((e)ng4) he forges a visa (证) so he can stay. On an advertising column (讠) he scribbles his fake visa, but (like me) he sucks at drawing, so he is only able to draw a stick figure (正) where his photo should go.

症 = 正 + 疒 : The stick figure (正) is visiting James II of England (zh) in the engine's bathroom ((e)ng4) to have him investigate his colorful rash (疒). Unfortunately James II of England has to tell him that he has cancer (症).

挣 = 争 + 扌 : The grim reaper (争) comes to the engine's bathroom ((e)ng4) to take James II of England (zh) with him. James II of England struggles (挣) to get free, but the grim reaper tightly grabs his back with a toy claw (扌).