So, Charlie, where are you? Are you there?
Charlie你在哪里？你還在嗎？

Hello？你還在嗎？
Yeah. 在呀在呀~

Are you there?
你在嗎？

You (still) there?
你還在嗎？

Yeah, I'm here.
我在這兒。

Hold on a sec.
稍等。

I thought someone was knocking on my door.
我剛才以為有人敲門呢。

Can you hear (see) me?
能聽得見我說話嗎？/看得見我嗎？

Yeah, I can hear (see) you.
聽得到，你聽得到我說話嗎？

Can you hear (see) me?
看得到，你聽（看）得到我嗎？

Anyone/anybody home?
有人在家嗎？

Anyone/anybody there?
有人在嗎？

Coming. 來了。
Who's there? 誰呀？
Who is it? 誰呀？
Hold on a sec. 等下。

Hello? 有人嗎？
Anyone there? 有人嗎？

Occupied. [ˈɑːkjupaɪd] 有人。
It's taken. 有人啦。