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你喘着气说你在跑步
→ “You're out of breath but still claiming you're running.”
你 nǐ³ = you — the person being spoken to (informal).
喘着气 chuǎn³ zhe qì⁴ = out of breath — literally 'breathing with panting', describing heavy breathing after exertion.
喘 chuǎn³ = to pant, to breathe heavily — like after running or exercise.
着 zhe = a particle indicating ongoing action — here, 'while' or 'with'.
气 qì⁴ = breath, air — specifically used here for heavy breathing.
说 shuō¹ = to say, to claim — used here in a sarcastic way, as if denying what's obvious.
你 nǐ³ = you — again, the person being addressed.
在 zài⁴ = at/in/doing — indicates an ongoing action. Here, 'are doing'.
跑步 pǎo³ bù⁴ = to run — literally 'run + step', a common term for jogging or running.
跑 pǎo³ = to run — the main verb for moving quickly on foot.
步 bù⁴ = step — often paired with 跑 to mean 'running' or 'jogging'.