英会話のコツ: In vs By

Common mistakes:

The concert starts 1 hour after

  • Meeting will finish 10 minutes

  • I will do my homework next lesson

In + time to Start /  Finish

Most students can use “ago”.   “In” is the opposite.

We use “in” to talk about the time remaining before an event starts or finishes.

Examples:

  • The concert starts in 1 hour

  • The meeting will finish in 10 minutes

  • Christmas is in two and a half months

  • 2017 starts in 6 months 

By + Deadline

We use “by” to talk about deadlines.  This deadline might be homework, a report, or payment.

Examples:

  • I will do my homework by next lesson

  • You have to finish this report by 8am next Monday

  • If I don’t see you by 12pm, I’m leaving.