diary的复数形式是变y为i再加es，即diaries。diary作为名词，是可数名词，中文含义有“工作日程记事簿”、“日记”、“日志”、“日记簿”、“记事簿”。

diary作为可数名词，意为(工作日程)记事簿;日记;日记簿。例句有：

1、I'll make a note of our next meeting in my diary.

我将把下次会议的事记在我的记事簿上。

2、Do you keep a diary?

你经常记日记吗？

3、One day he chanced upon Emma's diary and began reading it. 

有一天他偶然发现了埃玛的日记，便开始读了起来。

4、Friday at 11? I'll put it in my diary. 

星期五11点？我要把它记在记事本里。

5、It was later discovered that the diaries were a fraud. 

后来查明这些日记是伪造的。

6、The events were faithfully recorded in her diary. 

这些事件在她的日记中如实地记录了下来。

7、His excuse for forgetting her birthday was that he had lost his diary. 

他辩解说因为日记本丢了才忘了她的生日。

8、He prefaced the diaries with a short account of how they were discovered. 

他在前言中简要叙述了日记发现的经过。

9、Tell her I've got a window in my diary later on this week. 

告诉她我这周晚些时候有空儿。

10、Is reading a child's diary always a gross invasion of privacy? 

偷看孩子的日记一定是对个人隐私的严重侵犯吗？

11、If you can't remember your number, write it in code in a diary. 

如果记不住自己的号码，可以用代码记在日记簿里。

12、There was no immediate prospect of the diaries getting into print. 

这些日记近期不会发表。