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"both" 是英语中表示“两者都”的关键词，但它的用法有很多细节需要注意，比如位置、搭配、否定形式等。掌握这些规则，能让你在写作和口语中更准确地表达“两者”的概念！
"both" 可以放在名词前，也可以放在代词后（如 "them both"）。
❌ 错误用法："the Brahms concertos both"（不可放在名词后！）
✅ 例句：
He played both of the Brahms concertos. （他演奏了布拉姆斯的那两首协奏曲。）
He played both Brahms concertos. （他演奏了布拉姆斯的两首协奏曲。）
He played them both. ✅（正确）
He played the Brahms concertos both. ❌（错误）
"both" 强调“两者各自都符合某种情况”，而不是“合起来”。
✅ 例句：
Both guests have arrived. （两位客人都到了。）? 只有两位客人，都到了。
Both books weigh more than five pounds. （两本书每本都重五磅多。）? 不是两本加起来五磅！
It was having an effect on them both. （这正在他们两个人都起作用。）
如果动作是“两者共同完成”，不要加both，否则可能改变意思！
✅ 例句：
John and Mary got married. ? 两人结婚（彼此）。
Both John and Mary got married. ? 可能各自和别人结婚！
John and Mary are married. ? 两人是夫妻。
John and Mary are both married. ? 两人均已婚（可能和别人）。
⚠️ 注意：
She walked to the kitchen to bring us both a cup of hot coffee. （她给我们每人一杯咖啡。）? 不是两人共喝一杯！
不表示因果关系，只是并列两个事实。
✅ 例句：
John both loves Mary and wants to marry her sister. （约翰既爱玛丽，又想娶她妹妹。）? 并列，无因果！
John loves Mary and wants to marry her. （约翰爱玛丽，所以想娶她。）? 有因果关系！
"the mothers of both"（两人各自的母亲）✅
"both their mothers" ❌（可能混淆）
"both the girls' mother" ? 两姐妹的母亲。
"both the girl's parents" ? 一个女孩的双亲。
"I don't want both books." ? “我只要一本。”
"Both of them are not in good shape." ? 可能“两人都不好”或“并非两人都好”。
更清晰的否定：用"neither"！
❌ Both of them did not go swimming.
✅ Neither of them went swimming.（两人都没去游泳。）
错误例子：
"Both children had a different medical history." ❌ （两个孩子病历不同，不能用"both"！）
"In both cases, the second set of images revealed..." ❌ （两组照片情况不同，不能用"both"！）
✅ 正确改法：
"Each child had a different medical history."
"In each case, the second set of images revealed..."
"the"可加可不加，但通常不加更自然。
✅ 例句：
Both (the) students were excellent. （两个学生都很优秀。）
传统语法：介词先于"both"（对称结构）
✅ "in both China and other countries"
❌ "both in China and other countries"（不对称）
现代英语：习惯"both"先于介词
✅ "She was considering childbirth both as a woman and an obstetrician."
必须是“两者都适用”，不能用于不同情况。
避免“画蛇添足”，共同动作不加"both"。
否定时用"neither"更清晰。
所有格结构要准确，避免歧义。
"both... and..." 表示并列，不表因果。
______ my parents are doctors.
A) Both
B) The both
C) Both of
✅ 答案：A) Both
I don’t like ______ movies.
A) both
B) neither
C) either
✅ 答案：A) both（我只喜欢其中一部）
