Simplified Chinese - Reasons

你为什么___了？

Nǐ wèishénme ___ le?

Why did you ___?

Meaning: Why did you ___?

When to use: Use this to ask the reason for something that already happened. For a polite form use “您为什么___了？”

Tip: Don't confuse this with 你为什么想___？ (asks about wanting to do something).

你为什么想___？

Nǐ wèishénme xiǎng ___?

Why do you want to ___?

Meaning: Why do you want to ___?

When to use: Use this to ask why someone wants to do something (a present or future intention). For politeness, use “您为什么想___？”

___的原因是什么？

___ de yuányīn shì shénme?

What's the reason for ___?

Meaning: What's the reason for ___?

When to use: Slightly more formal or written; in speech you can also say “为什么会___？” Use this to ask for an explanation of a situation or event.

怎么会___

Zěnme huì ___?

How come ___?

Meaning: How come ___?

When to use: Common in spoken Chinese to ask why something happened; can express surprise about the event.

我这么做是因为___。

Wǒ zhème zuò shì yīnwèi ___.

I did it because ___.

Meaning: I did it because ___.

When to use: Use this to explain your own action or behavior.

我选它是因为___。

Wǒ xuǎn tā shì yīnwèi ___.

I chose it because ___.

Meaning: I chose it because ___.

When to use: Use this to explain why you picked an option or thing. If referring to a person, replace “它” with “他/她”.

是因为___

Shì yīnwèi ___.

It's because ___.

Meaning: It's because ___.

When to use: Often used to give a short answer to “为什么”. You can also say the full form “这是因为___”。

主要原因是___。

Zhǔyào yuányīn shì ___.

The main reason is ___.

Meaning: The main reason is ___.

When to use: Use this to state the most important reason. Common in both speech and writing.

Tip: Beginners sometimes say 原因主要是… which is understandable but less natural word order in many contexts.

我没能做到，因为___。

Wǒ méi néng zuò dào, yīnwèi ___.

I couldn't because ___.

Meaning: I couldn't because ___.

When to use: Use this to explain why you were unable to do something; in casual speech you can also say “我没办法，因为___”。

既然___，我就___。

Jìrán ___, wǒ jiù ___.

Since ___, I ___.

Meaning: Since ___, I ___.

When to use: Use mainland Mandarin structure “既然……就……” to show that a known situation leads to a decision or result.

你是因为什么决定___的？

Nǐ shì yīnwèi shénme juédìng ___ de?“，“dialect_or_region”：“Mainland Mandarin”，“localization_status”：“candidate

What made you decide to ___?

Meaning: What made you decide to ___?

When to use: A natural way to ask about the motive behind a decision. More casually you can say “你为什么决定___？”

你能解释一下为什么___吗？

Nǐ néng jiěshì yíxià wèishénme ___ ma?“，“dialect_or_region”：“Mainland Mandarin”，“localization_status”：“candidate

Could you explain why ___?

Meaning: Could you explain why ___?

When to use: Polite but not too formal; for more formality use “您能解释一下为什么___吗？” Use when you want someone to give a reason.

___有什么原因吗？

___ yǒu shénme yuányīn ma?“，“dialect_or_region”：“Mainland Mandarin”，“localization_status”：“candidate

Is there a reason why ___?

Meaning: Is there a reason why ___?

When to use: Use this to ask whether there is any reason behind a situation or action.