中式英文：

The workers started a strike for better working conditions.

改錯研析：

1. The workers started a strike over poor working conditions.

2. The workers were striking for better working conditions.

3. The workers were striking over poor working conditions.

(1) strike（罷工）當「可數名詞」時，以 a strike over something 來表示「罷工抗議某件事情」，如 a strike over pay cuts 是指「罷工抗議減薪」，並無 a strike for something 用法。

(2) strike（罷工）當「不及物動詞」時，以 strike for something 來表示「罷工爭取某件事情」，如以下 Macmillan 例句： 

Pilots were striking for a 6% salary increase.

（機師罷工爭取加薪6%。）

(3) strike 當「不及物動詞」時，也可用 strike over something 表達「罷工抗議某件事情」的概念，如以下 Macmillan 例句：

Car workers were threatening to strike over the job losses.

（車廠工人威脅發動罷工抗議裁員。）

(4) 罷工抗議的事情和罷工爭取的事情邏輯上「反相關」，因此抗議「工作環境欠佳」(poor working conditions)，就是爭取「較佳的工作環境」(better working conditions)。