What is the meaning of 的 in "有一天你会明白的"?

Question

From Why is 的 used in 你是哪一天出生的 and 我们什么时候开始的 and 前天你什么时候来的这里?, I understand 的 at the end of a sentence describes an event that happened in the past.

However, I am not sure whether I understand the meaning of 的 at the end of this sentence correctly:

有一天你会明白的。

This sentence emphasizes an event that might happen in the future. So 的 here is not describing an event that happened in the past. Correct?

Why does it have 的 at the end? Is it because 它 = it has been omitted? Such as:

有一天你会明白的它 = one day you will understand it.

Answer 1

In Taiwan, According to dictionary owned by Ministry of Education.

的 can mean:

句尾助詞：置於句尾，表示肯定或加強的語氣。

(助詞 at end of the sentence denoting affirmation, or intensify tone.)

有一天你會明白的它 is not correct. You put 它 at wrong position. 有一天你會明白它的 can be better.

Answer 2

000's answer is correct. 的 in 有一天你会明白的 is for affirmation. It implies that what the speaker can tell now is one day you will understand.

Answer 3

有一天你会明白的

加不加"的"的区别，在我看来，

不加"的"，感觉这句话没说完，听话的人还在等，"有一天我会明白什么？"

加"的"，明确表示这句话已经结束。

Answer 4

General discussion of the particle 的

According to Charles N. Li, Sandra A. Thompson - Mandarin Chinese: A Functional Reference Grammar, the particle 的 is the nominalization particle, which allows that a verb, a verb phrase or a sentence to function as a noun phrase. The nominalization is characterized by:

1. Must contain a verb with at least one of its participants unspecified (e.g., subject, direct object, indirect object, etc.).

2. If there is only one participant unspecified, the nominalization refers to this participant. For example:

   • 他没有我喜欢的。

     He does not have what I like.

     Here, 我喜欢的 is nominalized: because the subject 我 is specified, the verb 喜欢 (to like) is transitive and its object is unspecified, the nominalization makes reference to the direct object to mean what I like.

   • 种水果的很难过活。

     It is difficult for fruit growers to make a living.

     Here, 种水果的 is nominalized: because the verb 种 (to grow) has the object 水果 (fruit) specified, but its subject unspecified, the nominalization makes reference to the subject to mean fruit growers.

3. If both the subject and the direct object participants are unspecified, the nominalization will generally be understood to refer to the unspecified direct object of that verb. For example:

   • 这种植物可以当作吃的。

     （One) can take this type of plant as food。

     Here, 吃的 is nominalized: because neither the subject or the direct object are specified, the nominalization makes reference to the direct object to mean what is to be eaten = food.

Moreover, a nominalization can also function to modify a following noun and to formulate the 是...的 construction, which for example emphasizes details in the past or allows non-gradable adjectives to appear on the predicate.

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Our example:

有一天你会明白的。

You will understand it one day.

Here, 一天你会明白的 is nominalized: because the subject 你 is specified, 明白 is a transitive verb and the object is unspecified, the nominalization makes reference to the direct object to mean what one day you will understand.

Answer 5

000's answer is correct, 的 here is just a 句尾助語詞, no special meaning here

However I don't think any native speaker would say 「有一天你會明白它的」 ,it just sounds unnatural in any context. Maybe changing 它 to 他/她 would make much more sense to native speaker however that changes the whole sentence's meaning as well. So please just leave it as 總有一天你會明白的

Also Puco4's answer is not wrong, it's just irrelevant here, his/her mentioning the use of 的 is not applicable in this question. It is just a 句尾助語詞.