Bié / ná / gōng / zuò / máng / dāng / yóu / tou / nǐ / qí / shí / zhǐ / shì / lǎn / de / bāng / máng

别拿工作忙当由头，你其实只是懒得帮忙。

Don't use being busy at work as an excuse; you simply don't want to help.