i took the old man by the hand为什么hand前面要+the 为什么只能用by the hand 不能用by the ha...

he took her by the hand.\u8fd9\u53e5\u8bdd\u4e2d\u4e3a\u4ec0\u4e48\u8981\u52a0\u4ecb\u8bcdby\uff0c\u4e0d\u80fd\u76f4\u63a5\u662ftook her hand\u5417\uff1f

\u53ef\u4ee5\u76f4\u63a5\u7528took her hand,\u4e24\u53e5\u610f\u601d\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u524d\u4e00\u53e5\u5f3a\u8c03\u201ctook her\u201d,\u8eab\u4f53\u7684\u63a5\u89e6\uff0cby the hand \u662f\u4fee\u9970\u4f5c\u7528\uff0c\u800ctook her hand\uff0c\u76f4\u63a5\u8bf4\u7684\u662f\u201c\u62c9\u5979\u7684\u624b\u201d\u8fd9\u4e2a\u52a8\u4f5c\u4e86

by \u548c hand \u4e2d\u95f4\u53ea\u80fd\u52a0\u5b9a\u51a0\u8bcd\uff0c\u5982\u679c\u7528her \u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff1aby hand of her

1. 语言首先是一种说话习惯，遵循说这门语言人的认知规律和思维习惯，这里by the hand 中加定冠词也是说话习惯使然，并没有多少道理而言。因此在学习外语的过程中，一定要在语言的语法规则和使用习惯方面多下功夫，这样才能学得好。

2. by the hand 是行为方式短语，表示被触及、 被抓握住的身体部位或衣物某处，英语用得较多。请看例句：

   The old man patted the boy on the head gently. （on the head）

   老人轻轻拍了拍孩子的头。

   Sagecious Lu seized the butcher by the collar. （by the collar）

   鲁智深揪住郑屠的衣领。

pat sb on the head
take sb by the hand
固定用法。
the+部位

英语里就是这么说的
如： hit him on the head

固定用法：
take sb by the hand 抓住某人的手
I took the old man by the hand .
意思是“我抓住那个老人的手。”
又如：
1. He clasped his old friend by the hand.
　他紧紧地握住老朋友的手。
2. Her mother took her by the hand and went along the street . .
她妈妈抓住她的手沿着街道走。。
拓展：
介词+the+身体部位
如：
Jim patted him on the head .
吉姆拍拍他的头。

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