这个中心由谁管理？
Who is managing the Centre?
In this sentence, the preposition "由" is similar to ''by'' in English. It introduces the doer of an action. Have a look at the following sentences.
| Subject | + 由 | + doer (a person, a company or an organization) | + Verb |
|---|---|---|---|
| 这个中心 | 由 | 谁 | 管理？ |
| This centre is | by | who | managed? |
| 这个中心 | 由 | 六个执行伙伴 | 管理。 |
| This centre is | by | six implementing partners | managed. |
| 公司的情况 | 由 | 王先生 | 介绍。 |
| The situation of the company will be | by | Mr. Wang | introduced. |