sb是什麼的縮寫

例句：

1、Has somebody helped himself to some film star's diamonds?

有人偷了某個影星的.鑽石了嗎?

2、Somebody else lent me a pump and helped me mend the puncture.

別人借給我一個打氣筒，又幫我補好了輪胎。

3、If I reduced somebody to tears I'd be mortified.

如果我把誰弄哭了，我會尷尬的。

4、Somebody hired from another country is not likely to resign precipitately.

外國僱員不可能貿然辭職。