diff --git "a/docs/\345\256\232\350\257\255\344\273\216\345\217\245.md" "b/docs/\345\256\232\350\257\255\344\273\216\345\217\245.md"
index 0be3224e1059f1f51f9774f9d0ec6deeb7699ad2..d368166828cef1462d2d4757f5d5508ecf09d5a3 100644
--- "a/docs/\345\256\232\350\257\255\344\273\216\345\217\245.md"
+++ "b/docs/\345\256\232\350\257\255\344\273\216\345\217\245.md"
@@ -1,8 +1,6 @@
-# 定语从句
+# 定语从句 (限定范围) who-人/which-物
 
-## 定语从句(限定范围) who-人/which-物
-
-**who-人 :定语从句形成过程**
+## **who-人 :定语从句形成过程**
 
 我认识那个在车里哭的人 (man作为主语，用who)
 
@@ -116,3 +114,35 @@
 * I don't understand the reason    he left me  for/because of   the reason.
 * I don't understand the reason  for which/because of which    he left me.
 * I don't understand the reason why he left me.
+
+## 非限定 定语从句（补充说明） - 插入语
+
+* I like my father, who is good to me.
+* He left without bye bye, which made me sad. 
+* I'm from China, which is my home.
+
+## That 偷懒行为 (which/who = that)
+
+* which = that
+* where = (in/on) + which
+* 所以: where != that    (而 in that 因为; 原因是;)
+
+
+* I'm from China, which is my home.
+* => I'm from China, and that is my home.  （两个句子连接，需要连接词，不然就变成2个句子了）
+
+## 必须用 that 有强调作用
+
+all, everything, anything, nothing, little,
+much, any, each, no, some, few, the only, the very,
+the ---est, the ---th.
+
+* You are the most beautiful girl that I have ever seen.
+
+--> 特例（严谨性）
+
+You are not the only one who understands contract.（用who主要是想说这是人，而that(不合适)因为它还可以表示物）
+
+---
+
+I know the man (who is) smiling in the car = I know the man smiling in the car.