呢句點用英文講？

004 同006 嘅文法都啱。
004 好似長咗 d.
006 missed 咗 [响 office] 等。

我提議：

Mr Chan will be back shortly, please have a seat in his office.

Mr. Chan will be back coming soon,
please wait the moment at the office.

hi, u can say ...
Mr Chan is coming back, maybe you can wait in his office.

Mr Chan will come back soon,please wait him in his office.

發現好多小mistake...
我應為"Mr Chan will be back very soon, please wait a moment." 較為恰當.

2009-04-18 01:01:57 補充：
好認同007o既answer!!!我覺得佢ｏ個句好似較我的好！　ｇｏｏｄ！！！

Mr Chan will return at a moment, please at the his office for a while.

The first anwser is not correct.
The 2nd one is OK, but at his office should be in his office
My answer for your reference:
Mr. Chan is coming back very soon, would you please wait for him in his office.

Mr Chan will be back,please wait for a mament.

Mr. chan will come back soon, can you wait at his office?

Mr. Chan will be back coming soon, please kindly wait
at the office.