在英语中，设定闹钟的表达方式有以下几种：

Set an alarm
"I need to set an alarm for 6:00 AM tomorrow."
"Can you set an alarm for me at 7:00 PM?"
Set the alarm
"I'm going to set the alarm for 7:00 AM."
"Can you set the alarm for me at 8:00 PM?"
Set an alarm clock
"I need to set an alarm clock for 6:00 AM tomorrow."
"Can you set an alarm clock for me at 7:00 PM?"
Set the alarm clock
"I'm going to set the alarm clock for 7:00 AM."
"Can you set the alarm clock for me at 8:00 PM?"

这些表达方式都可以用来指设定闹钟。其中，"alarm" 和 "alarm clock" 都可以指闹钟，前者更常用于口语中，后者更常用于书面语中。

来源：

英文单词 "alarm" 和 "alarm clock" 都源自中文语言。"Alarm" 源自拉丁语单词 "alarma"，意思是警报。这个词最初是用来描述某些事件发生时会发出的警报声，后来才演变成指闹钟。"Alarm clock" 则是由 "alarm" 和 "clock" 两个词组合而成的，"clock" 源自古法语 "cloche"，意思是钟。

英文例句：

I set the alarm for 7:00 AM so I can get up early and go for a run.
I always forget to set the alarm, so I usually end up oversleeping.
I use my phone as an alarm clock because it's more convenient than a separate alarm clock.
I set an alarm for 6:00 AM so I can have enough time to get ready for work.
I'm going to set the alarm clock for 7:00 PM so I can get to bed early tonight.

中文翻译：

我设定了 7 点的闹钟，这样我就可以早起去跑步了。