在'The letter was written by her'这个句子里，动词用的是被动语态。

In the sentence 'The letter was written by her', the verb is used in ___the ___passive.

我今天的英语课重点学习了如何构成和使用被动语态。

My English lesson today focused on how to form and use ___the ___passive.

正式报告经常偏爱使用被动语态，以显得更加客观。

Formal reports often favour ___the ___passive voice to sound more objective.