Leave him alone vs Let him be

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

Leave him alone

InformalTop 2,000 (common)

Let him be

Top 5,000 (fairly common)
Most formal: Let him beMost common: Leave him alone
 Leave him aloneLet him be
Pronunciation🇬🇧 //liːv hɪm əˈloʊn//🇺🇸 //liv hɪm əˈloʊn//🇬🇧 //lɛt hɪm biː//🇺🇸 //lɛt hɪm bi//
MeaningStop bothering him.Allow him to be as he is.
ExampleYou should really just leave him alone; he needs some time to think.Sometimes, it's best to just let him be and not interfere.
RegisterInformalNeutral
How commonTop 2,000 (common)Top 5,000 (fairly common)
Collocationsjust leave him alone, leave him alone for now, please leave him alone, leave him alone and relaxlet him be himself, let him be free, let him be happy
Common mistakesOverusing in formal discussions where politeness is required., Confusing with other phrases like 'let him be' which can have different connotations.Using it in a context where a command is needed instead of acceptance., Confusing with similar phrases like 'let it be' which conveys a different sentiment.
Usage notesUse in casual settings to tell someone not to disturb or trouble another person. Avoid in formal contexts.Commonly used to express acceptance or resignation regarding someone's behavior or state. It can be used in both casual conversations and more serious discussions.

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Leave him alone
Let him be

Frequently asked questions: Leave him alone vs Let him be

What's the difference between Leave him alone and Let him be?

Leave him alone: Stop bothering him. Let him be: Allow him to be as he is.

Which is more formal: Leave him alone and Let him be?

Let him be is the most formal of these.

Which is more common: Leave him alone and Let him be?

Leave him alone is the most common in everyday English.

Can you show an example of each?

Leave him alone: You should really just leave him alone; he needs some time to think. Let him be: Sometimes, it's best to just let him be and not interfere.

Can I use Leave him alone and Let him be interchangeably?

Not always. Leave him alone and Let him be 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.