把 and 被 Control

请把文件发给我。

Qǐng bǎ wénjiàn fā gěi wǒ.

Please send the document to me.

计划被突然改变了。

Jìhuà bèi tūrán gǎibiàn le.

The plan was suddenly changed.

我能看出把的位置。

I can identify the position of 把.

Review where this pattern appears in the sentence.

这个问题已经被解决了。

This problem has already been solved.

被 can appear without an explicit agent.

我把杯子放在这里。

I put the cup here.

把 often needs a result after the verb.

我们把问题解决了。

We solved the problem.

The result verb makes 把 useful.