| Location | Interpretation | Examples |
| Book 1 Lesson 13 | “le1” can be placed after the verb to indicate that someone has done something; if the verb with “le” is followed by an object, the object usually has quantity, adjectives or pronouns as attributives. | 我买了五个苹果。 大为吃了很多中药。 |
| Book 2 Lesson 15 | “le2” affirms the completion or realization of things; only indicates the past; but the past events do not necessarily use “le2”. | 你去哪儿了？ 你买什么了？ 我去商场了。 我买衣服了。 |
| Book 2 Lesson 15 | “le” at the end of the sentence has both “le1” and “le2”unctions. It indicates the completion or realization of an action and the affirmation of completion or realization. | 我懂了。 他去了。 刚才宋华来了。 |
| Book 2 Lesson 23 | “要……了” means the action is about to happen. | 天气要热了。 |
| Book 2 Lesson 24 | Used at the end of a sentence to indicate a change of situation or the emergence of a new situation. It is often used in adjective predicate sentences or sentences containing “有” and “是”. | 现在天气冷了。 你舅妈也开始用电脑了。 |
| Volume 3, Lesson 30 | Used behind noun phrases, subject-predicate phrases, etc. to indicate changes in situations or the emergence of new situations. This kind of sentence is usually used to remind or attract the attention of others. | 他八岁了。 |
| Book 4 Lesson 43 | “V/A + 死 + 了” indicates the psychological degree. | 我饿死了。 |