At, on and in for time

Approximate A1–A2 · editorial content label, not a certified rating.

A useful starting pattern is at for clock times, on for days and dates, and in for months, years and broader periods. Say at six, on Monday and in October. No preposition normally precedes next, last, this or every in time phrases such as next week.

Try the three exercise formats

Examples to compare

  • The class starts at six.
  • We meet on Tuesday.
  • She arrived last week.

Watch the meaning and the limits

Fixed expressions and dialect differences exist. British at the weekend and American on the weekend are both established; neither is a universal error. Learn the whole phrase and use the sentence’s stated context. In ten minutes can describe time until an event, not a calendar date.

Read each example aloud, then change one detail to make a sentence you could use. Continue with focused practice when you want a different set.

Common mistakes and how to fix them

Mistake: We meet in Monday.

Use: We meet on Monday.

Use on with a named day.

Try the pattern

3 choose questions · 2 sentence completions · 2 word gaps. Read the reason after every answer. No timer.

Typed answers stay on this page. This guided set checks the requested construction; it does not judge general writing. Read the accepted answers and reasons.

Use it in your own sentence

Write one sentence about your own routine or situation. Check the subject, verb form and intended meaning against the rule above. A different sentence may need a different form: these exercises accept the reviewed answers for their stated context.

Try the next practice set, or choose another grammar point.

All drill answers and reasons

  1. The class starts ___ six o’clock.

    Choices: at / on / in

    Accepted: at

    Use at with this clock time.

  2. We meet ___ Tuesday.

    Choices: on / at / in

    Accepted: on

    Use on with a named day.

  3. The exhibition opens ___ October.

    Choices: in / on / at

    Accepted: in

    Use in with a month.

  4. Complete with a preposition and Monday: We meet ___ .

    Accepted: on Monday

    On goes before a named day.

  5. Complete with a standard preposition and the weekend: We relax ___ .

    Accepted: at the weekend / on the weekend

    At the weekend is common in British English; on the weekend is common in American English. Both are accepted.

  6. The train leaves ___ seven o’clock. Use at, on or in.

    Accepted: at

    Use at with a clock time.

  7. The course starts ___ November. Use at, on or in.

    Accepted: in

    Use in with a month.

Practice questions

How do the three exercise formats work?

Choose asks you to pick an answer. Complete the sentence asks you to type the missing phrase. Fill in the word asks for one word, or no article where stated. Every checked answer includes a reason.

Which typed answers are accepted?

Use the form and meaning requested in the prompt. Reviewed alternatives and contractions are accepted where they fit. Capital letters, surrounding spaces, straight or curly apostrophes and a final full stop, question mark or exclamation mark do not affect marking. The answer reference lists the accepted forms.

Are my typed answers sent or saved?

Typed answers stay on this page in your browser. They are not sent to the server or saved. If device progress is available, completing a set records only the activity and study points on this device.

Can this check my own writing or certify my level?

No. This is a small guided set with reviewed answers, not a general grammar checker or a level certificate. An unlisted answer does not mean it is always wrong in English. Read the prompt and the explanation for this construction.

Further reference: Cambridge English Grammar Today. The explanations, examples and exercises here are original; each lesson covers a useful pattern rather than every exception.