What is difference between 'next day and in the next day'?

Answer 1

First, one of the most confusing things when learning English as an international student is which times do you use prepositions, and which times do you not use them. In this case, there is no English expression "in the next day." So if you say it, you may be understood, but it's not good English. Generally, with days of the week, we use "on"-- On Monday, I will begin teaching my Journalism class. Could we get together on Thursday?

Normally, we say "the next day"-- this means the day after, or the following day: He went to school on Friday. The next day was Saturday, and he did not go to school. And sometimes, you will see it phrased as just "next day" when it is describing something: That shipping company is very fast-- it offers same day delivery, but it also offers next day delivery. However, there may be a time when something like what you said could occur. The closest to your question is "in the next few days"-- which means during a brief period of time that may take a couple of days but we are not sure how long. "I plan to take the class on a field trip sometime in the next few days. I will let you know the exact date as soon as I get all the details."