My colleague looked tired this morning, and when he said he’d worked until 1 a.m., I said, “No wonder you’re so sleepy today!”Let’s learn how to say “no wonder / that explains why” in Chinese.

难怪 （nán guài)

Hello，大家好，我是Janine。Hello, dàjiā hǎo, wǒ shì Janine.Hello everyone, I’m Janine.

今天早上我去公司，发现同事看起来很累。Jīntiān zǎoshang wǒ qù gōngsī, fāxiàn tóngshì kàn qǐlái hěn lèi.This morning at work, I noticed my colleague looked really tired.

我问他：“你昨晚没睡好吗？”Wǒ wèn tā: “Nǐ zuó wǎn méi shuì hǎo ma?”I asked him, “Didn’t you sleep well last night?”

他说：“我昨天晚上加班到一点。”Tā shuō: “Wǒ zuótiān wǎnshang jiābān dào yī diǎn.”He said, “I worked overtime until 1 a.m.”

我笑着说：“难怪你今天这么困！”Wǒ xiào zhe shuō: “Nán guài nǐ jīntiān zhème kùn!”I smiled and said, “No wonder you’re so sleepy today!”