Let you know vs Tell

When to use each in English, with meaning, register, and examples.

Let you know

Top 1,000 (very common)

Tell

Top 1,000 (very common)A1verb
 Let you knowTell
Pronunciation🇬🇧 //lɛt jʊ nəʊ//🇺🇸 //lɛt jə noʊ//🇬🇧 /["/tel/","/telz/","/təʊld/","/ˈtelɪŋ/"]/🇺🇸 /["/tel/","/telz/","/təʊld/","/ˈtelɪŋ/"]/
MeaningTo tell someone information later.to say information to someone
ExampleI will let you know as soon as I have more information.I want to tell you a secret.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR level-A1
Part of speechverb
Collocationslet you know later, let you know soon, let you know when, let you know tomorrowbluntly, curtly, flatly, want to, be going to, try to, about, of, to, firmly, sternly
Antonyms-hide, withhold, suppress
Common mistakesUsing 'let you know' instead of 'let me know' when speaking about oneself., Confusing 'let you know' with 'let you see' – they have different meanings., Forgetting to follow up on the promise to inform someone.Saying 'tell to' instead of just 'tell'., Using 'tell' without a direct object., Confusing 'tell' with 'say' in contexts where direction is implied.
Usage notesCommonly used in informal speech to indicate that you'll inform someone about something. Suitable in both personal and professional contexts.Use 'tell' when you inform someone about something. It's neutral and suitable for most contexts. Avoid using it in overly formal writing; instead, use 'inform' or 'notify'.

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Let you know
Tell

Frequently asked questions: Let you know vs Tell

What's the difference between Let you know and Tell?

Let you know: To tell someone information later. Tell: to say information to someone

Can you show an example of each?

Let you know: I will let you know as soon as I have more information. Tell: I want to tell you a secret.

Can I use Let you know and Tell interchangeably?

Not always. Let you know and Tell are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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