我不会翻译啊，好难。

1、我的自行车已修好。
<br>My bike has been mended.
<br>2、我的叔父正在接受警方调查。
<br>My uncle is being investigated by the police.
<br>3、这座城市始建于1874年。
<br>This city was built in 1874.
<br>4、这种行为应该受到批评。
<br>This act should be criticized.

是你的被动语态成话练习吧？

1 My bicycle has already been ment.
2 My uncle is currently subjected to a police investigation
3 This city was initially built in the year 1874
4 This kind of behaviour deserves criticism.

1. My bike has been aready repaired.
2. My uncle is being questioned by the police.
3. The city was built in 1874.
4. The kind of behavior should be criticized.

My bicycle has been repaired.
My uncle is under inspection of police.
This city was established in 1874 initially.
This behaviour should be punished.

1、我的自行车已修好。
My bike has been repaired already.
repair较通常一点,很少用mend来