let someone know

Meaning

To inform someone about something, tell them a piece of information, or give them an update. It is extremely common in both casual conversations and professional emails, serving as a polite and friendly way to offer or request information.

Examples

• Please let me know if you can make it to the dinner tonight.

  Please let me know if you can make it to the dinner tonight.

• I will let you know as soon as the package arrives.

  I will let you know as soon as the package arrives.

• Could you let someone know that the meeting has been rescheduled?

  Could you let someone know that the meeting has been rescheduled?

• Just let me know what time works best for you.

  Just let me know what time works best for you.

• He promised to let us know his decision by the end of the day.

  He promised to let us know his decision by the end of the day.

Common Mistakes

• ✗ Please let me to know when you are ready.

  ✓ Please let me know when you are ready.

  The causative verb 'let' is followed by an object and a bare infinitive (the base form of the verb without 'to').

• ✗ I will let know him about the change.

  ✓ I will let him know about the change.

  The pronoun representing the person being informed must go between 'let' and 'know'.

Related Expressions

Practice

• When you find your keys, please ___.

  💡 inform me

  Show answer

  let me know

• If you change your plans, make sure to ___.

  💡 tell someone

  Show answer

  let someone know