We haven't seen them for ages; why not ask them over for lunch on Sunday?

我们很久没有见到他们了，何不星期天请他们到家里吃午饭呢？

youdao

If you seem to get along with them then why not ask them to do something? If you like your new coworker or classmate, ask them if they want to grab a drink later, or come by your place to chill.

你似乎与他们相处地不错，那么为什么不问问他们做了什么？

youdao

Why not just ask them?

为什么不问问他们呢？

youdao

Obviously BP pays for it, but why not ask them to just completely step aside on that front?

WHITEHOUSE: Deepwater BP Oil Spill: Presidential Press Conference

While you're at it, why not ask them for feedback on your vision for the future and how it might affect them?

FORBES: Magazine Article

If they're not part of the 90 percent of Americans who agree on background checks, then ask them why not.

WHITEHOUSE: President Obama Speaks on Reducing Gun Violence