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A vs Per
When one must use "per" instead of "a". For example, which of these sentences is right?
They all usually slept for just four hours a night.
They all usually slept for just four hours per night.
2015년 1월 28일 오후 6:10
답변 · 4
2
In many cases they can be interchangeable.
'Per' is used more where there is some kind of calculation involved, especially in business or scientific contexts.
'A' is more common in everyday contexts.
2015년 1월 28일
1
For me, "per" is used when it comes to price, speed or any other ratio. $10 per night, 20 miles per hour.
I would put "a" here. "They all usually slept just four hours a night". Without "for"
2015년 1월 28일
1
This is a difficult one and I don't know any rules governing their usage. To my North American ears, both sentences sound OK for the spoken language, but, I would use 'per' when writing. Also, "what is the price per square foot?" is correct but "what is the price a square foot?" sounds horrible. I hope this helps.
2015년 1월 28일
a = per
2015년 1월 29일
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