People often confuse when to use “in,” “at,” and “on” when talking about time. To avoid confusion, we are just going to focus on how to use “in” in Episode 2 of the English Mini-Lessons Podcast. Here are some general rules:
Use “in” before a unit of time.
Examples: I will see you in an hour. It is 11:00 now. I will see you at 12:00. He can walk five miles in one hour. The package will arrive in three days. (This means three days in the future.)
Use “in” before a year.
Examples: He was born in 1975. The Olympics will take place (happen) in 2020.
Use “in: before a month.
Examples: I will see you in September. She will see you next month for your next appointment.