became、become、turned 1. became：动词过去式（“become” 的过去式，如 He became a doctor 他成了一名医生、became angry 变得生气），侧重 “从一种状态变为另一种状态”； 2. become：动词原形 “成为；变得”（如 become famous 成名、become better 变得更好），过去分词与原形同形（如 have become 已经成为）； 3. turned：“变成（过去式）”（如 The leaves turned red 叶子变红了、turned into 变成），比 became 更侧重 “外观 / 颜色变化”，became 可指 “身份 / 状态变化”； 4. 注意：become 无被动语态，不可说 “was became”。
精选例句
高考
1、 When the tiny creature arrived on January 31, she became the 40th black rhino to be born at the reserve.
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