摘要：Why do so many climbers risk their lives? One of the main reasons is because people want to challenge themselves in the face of di

Why do so many climbers risk their lives? One of the main reasons is because people want to challenge themselves in the face of difficulties. 人教版八年级英语下册这句话是存在问题的，我们看下。

"reason is because" 属于冗余错误表达‌

语法冗余‌

"reason"‌ 和 ‌"because"‌ 都表示原因，同时使用造成语义重复（相当于说"原因是因为..."）

英语语法规则要求：

❌ ‌错误结构‌：The reason is because...

✅ ‌正确结构‌：The reason is that...

句式对比‌

错误表达 正确表达

One of the main reasons ‌is because‌ people want... One of the main reasons ‌is that‌ people want...

(冗余：reason + because双重表因) (清晰：reason后用that引导表语从句)

原句修正：‌

Why do so many climbers risk their lives? One of the main reasons ‌is that‌ people want to challenge themselves in the face of difficulties.

强调版‌：

The main reason climbers take risks ‌is to‌ challenge themselves... （用不定式表目的）

补充说明

尽管口语中偶见 "reason is because" 的用法，但在正式写作和考试中均采用 ‌"reason is that"‌ 作为规范表达。登山者案例中，所有规范文本均使用 ‌"is that"‌ 结构。

来源：人尔个个