It's the objective case of they.

是they的宾格。

Uh, so, Charlie Bingham just invited us over...

查理·宾格温邀请我们。

So, actually that again is the object pronoun.

所以这又是宾格。

" Who" is the subject pronoun, " whom" is the object pronoun.

Who 是主格，whom 是宾格。

We already know that this one, that's an object pronoun.

我们已经知道这个是宾格。

Do we need the subject or object pronoun?

我们需要主格还是宾格？

Me and Eric will be there soon.

（宾格）我和埃里克很快就会到了。

Me will be studying alone tonight.

我（宾格）今晚将独自习。

'Whom to follow' — that's technically correct.

用宾格形式表达“关注谁”——严格意义上讲这才是正确的。

Both words are pronouns, but I as a subject pronoun and me is an object pronoun.

这两个词都是代词，但 I 是主格，me 是宾格。

And this is an object pronoun.

这是一个宾格。

It's Charlie Bingham. He's the guy that my dad wanted me to call. I googled him. Look.

查理·宾格温。就是我爸让我联系的那个人。我搜了他。看。

In formal writing, yes, when it's appropriate, when you need the object pronoun, sure, use " whom" !

在正式的写作中，在适当的时候使用，当需要宾格的时候，当然要用 whom！

Well, " her" that's an object pronoun and that doesn't sound good.

" her" 是宾格，听起来怪怪的。

Fiona Kolbinger has become the first woman to win the transcontinental race, one of the most grueling in cycling.

菲奥娜·科尔宾格成为首位赢得横贯大陆自行车赛冠军的女性，这是自行车比赛中最艰苦的比赛之一。

He first found widespread fame as the bespectacled ghost hunter Egon Spengler in the Ghostbusters films in the 1980s.

他首次声名鹊起是因为20世纪80年代影片《捉鬼敢死队》中的捉鬼人埃贡·斯宾格勒。

And you'll notice whether it's a subject pronoun or an object pronoun.

会注意到它是主格还是宾格。

And the feminine " her" is the object pronoun.

而女的 her 是宾格。

When will your cowboys read Spengler?

的牛仔什么时候会读斯宾格勒？

Of course, we need the object pronoun, so it would be " I've known him for ages" .

当然，我们需要宾格，这样就可以是，“我已经认识他很多年了”。