Definition

1. Conjunction:
   • Because, the reason is that: "là vì" is used to introduce a clause that explains the reason or cause for something stated earlier. It emphasizes the causal relationship.

Usage

• Position in Sentence: Typically used after stating a situation or fact, followed by the explanation. The structure is often: [Statement/Result] + là vì + [Reason/Cause].
• Function: Provides a clear, emphasized reason. It is more emphatic than just "vì" alone.
• Formality: Neutral; used in both spoken and written Vietnamese.

Usage Examples

• Conjunction: (I was late because my car broke down.) (She is sad because her best friend moved away.) (We canceled the trip because the weather was bad.)

Advanced Usage

• Emphatic Contrast: Can be used to strongly contrast a stated reason with an assumption or another possible reason. (He doesn't hate you; he is quiet because he is thinking.)
• In Explanatory Answers: Frequently used to start an answer that directly explains a "why" question. ("Why did you help me?" – "It's because I value you.")

Variants and Related Words

• Vì (conjunction): Because, for. (A more common and slightly less emphatic synonym). (I'm tired because I stayed up late.)
• Bởi vì (conjunction): Because, on account of. (Similar in meaning and emphasis to "là vì"; often interchangeable). (I like this city because it is very lively.)
• Do (conjunction): Due to, because of. (Often used for more formal or objective causes). (The delay was due to traffic.)

Synonyms

• Bởi vì: Because.
• Vì: Because, for.
• Nguyên nhân là (phrase): The reason is.

Related Phrases

• Chẳng qua là vì (phrase): Simply because, it's just that. (I said that simply because I am worried about you.)
• Cốt là vì (phrase): The main reason is that, primarily because. (He works hard primarily for the sake of his family.)