1) "You need to respond to at least 100 messages a day." 2) "You need to respond to at least 100 messages per day." 3) "You need to respond to at least 100 messages daily." Which is the most appropriate and mostly used in formal letters?

2022年10月9日 · Therefore, "per day" means "for each day". In your example of "he run 20 km per day during last 10 days", it means "he run 20 km for each day during last 10 days". As you suggested, it is not average, it refers to a day. Another example would be "the doctor asked me to take 2 pills per day" = "the doctor asked me to take 2 pills for each day".

2021年2月7日 · @Boyep The meaning of the first sentence is clear: it happened each / every day before this. What's left out is the number of times it happened. For instance, it happened twice per day before this or it happened four times per day before this. –

2013年8月29日 · In some contexts, either one could mean exactly once per day, or an unspecified number of times per day. Like if your doctor said, "Take this medicine daily", that would be understood to mean one pill per day. Or if you said, "We update the customer file every day", that would normally be understood to mean once per day.

2019年4月6日 · "per" generally means an averaging. One may study for 5 hours one week, and 15 the next, and achieve 10 hours per week. "each" generally means either an equal distribution, or a minimum, or both. Studying 10 hours each week would mean at least 10 hours every week.

2022年5月9日 · "on a day" is the only incorrect usage here. Most native speakers would probably use "per day," but you can also use "in one day". Alternatively, you can restructure the sentence so it sounds more natural, like "I don't eat more than three tablespoons of molasses in one day" –

2020年11月5日 · "Once every day" has the emphasis on it being extremely important that you don't miss a day. Such as a doctor telling you to take your medicine once every day. This doesn't really apply here. "Once per day" is similar to "once a day" but a bit more formal. Probably more formal than is necessary here but it wouldn't be weird.

There are many good techniques that can help, for example you could learn only a few words per day, and repeat them over time. Flash cards are a practical application of this. If over time you feel you forget the words you knew only a few days back, then you are learning them too fast, and you should slow down.

2019年11月26日 · Saying that somebody has to pay a certain amount per month (or per hour, per day, per week, etc.) does not imply anything as to when and how frequently the payments are to be made. The only information that such a formulation conveys is how the total amount of the payment, whenever it is made, is related to the period of time for which it is ...

2019年6月18日 · A total number of working hours per day is often used in flexible working systems with core hours, i.e. hours when everyone is expected to be in: "working hours: 37.5 per week, core hours 10-4" (typical in a job specification). Work hours isn't as …