原来你关了空调，怪不得这么热！

Yuánlái nǐ guān le kōngtiáo, guàibùdé zhème rè!

So you turned off the air conditioner—no wonder it’s so hot!

原来你昨天没睡，怪不得你今天黑眼圈那么大。

Yuánlái nǐ zuótiān méi shuì, guàibùdé nǐ jīntiān hēiyǎnquān nàme dà.

So you didn’t sleep last night—no wonder your dark circles are so bad today.

他从外国留学回来，怪不得他英文那么好。

Tā cóng wàiguó liúxué huílái, guàibùdé tā Yīngwén nàme hǎo.

He came back from studying abroad—no wonder his English is so good.