sb.

The government sent sb. to inspect our school.

政府派人来视察我们学校。

The man was on trial for killing sb.

此人因杀人而受审。

A trustworthy person is sb. that you can trust.

可靠人是可信任。

I had an uneasy feeling that sb. was watching me.

有人在盯着看我，我感到挺不自在。

There's sb. lurking behind that bush.

有人埋伏在灌木丛后面。

There has been a disturbance in the street; sb. has been hurt.

街发生了一阵骚乱，有人被打伤了。