你为何不

why don't you

→ 你
phrase Uncommon #11,829
why don't you Usually followed by a verb; asks why someone does not do something.
CH: 你为何不试试这个?
EN: Why don't you try this?

你为何不吃完?

Why don't you finish your food?

— 蒲公英 (1985)

你为何不用另外一支?

Why don't you use the other one?

— 虎胆龙威 (1988)

你为何不带我走?

Why didn’t you take me with you?

— 谜一样的双眼 (2009)

你为何不离开呢?

Why don't you leave?

— 惊魂记 (1960)

那你为何不保卫它呢?

Then why don't you defend it?

— 烈日灼人 (1994)

你为何不关心我们?

Why don't you care about us?

— 天才一族 (2001)

你为何不打给他?

Why didn't you call him?

— 痛苦与荣耀 (2019)

那你为何不回答?

Then why didn't you answer?

— 奥本海默 (2023)

你为何不到警察局来?

Why didn't you come to the police station?

— 虎胆龙威 (1988)

你为何不放弃?

Why don't you give up?

— 蒲公英 (1985)

那你为何不报告给纠察使署呢?

Then why didn’t you report it to the Office of the Censors?

— 罗生门 (1950)

你为何不反抗他?

Why don't you resist him?

— 奥本海默 (2023)

你为何不滚远一点算了

Why don’t you just get lost?

— 青春年少 (1998)