有人敲门。
Someone is knocking at the door.
有人说没有这样的事儿。
Some people say there's no such thing.
有人对我说过这件事。
Someone told me about this.
有人这么说，我可没有看见。
Some people say this, but I've never seen it.
有人认为不应这样做。
Some people believe that it shouldn't be done like this.
就是有人反对，也是少数。
Even if there are some who oppose this, they are in the minority.
这件事有人知道，有人不知道。
Some people know about this and some don't.
你们中间有人懂英语吗?
Is there anyone among you who can understand English?
我们这里有人懂英语。
Some of us can understand English.