被动语态是英语语法中的一个重要概念，它用于强调动作的承受者而不是执行者。被动语态的基本结构是： 被动语态助动词（be动词）+过去分词。根据时态的不同，被动语态的构成也会有所变化。以下是一些不同时间下的被动语态例句：

一般现在时

The book is read by me.

The classroom is cleaned every day.

一般过去时

The letter was written by her.

The new shop was built last year.

一般将来时

The cake will be baked by my sister.

A new hospital will be built in our city.

现在完成时

This book has been translated into many languages.

Many man-made satellites have been sent up into space by many countries.

含有情态动词的被动语态

Young trees must be watered often.

Your mistakes should be corrected right now.

现在进行时的被动语态

My bike is being repaired by Tom now.

Trees are being planted over there by them.

不定式的被动语态

There are two books to be read.

There are twenty more trees to be planted.

通过这些例句，可以看到被动语态能够使句子结构更加灵活，同时可以强调动作的承受者，避免重复使用执行者的名字或代词。希望这些信息对你有所帮助。