I know you vs I'm not a stranger

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

I know you

High-frequency chunk

I'm not a stranger

Top 3,000 (common)
Most common: I know you
 I know youI'm not a stranger
Pronunciation🇬🇧 //aɪ nəʊ juː//🇺🇸 //aɪ noʊ ju//🇬🇧 //aɪm nɒt ə ˈstreɪndʒə//🇺🇸 //aɪm nɑt ə ˈstreɪndʒər//
MeaningI understand what you are saying or feeling.I don't know you.
ExampleWhen I saw her across the room, I smiled and said, 'I know you!'When I saw her again, I smiled and said, 'I'm not a stranger.'
RegisterNeutralNeutral
How commonHigh-frequency chunkTop 3,000 (common)
CollocationsI know you well, I know you too, I know you are, I know you like, I know you understandnot a stranger anymore, not a stranger to you, feel like I'm not a stranger
Common mistakesOmitting 'I' when it's a clear statement of understanding., Confusing with 'I don’t know you', which has a different meaning., Using it in overly formal situations where a more detailed response is needed.Using it when meeting someone for the first time, Confusing it with 'I'm not a visitor', Misunderstanding the tone as aggressive
Usage notesCommonly used to express understanding or familiarity. Appropriate in both casual and serious contexts.Used to express familiarity with someone. Appropriate in casual or semi-formal contexts, but may seem overly familiar in very formal settings.

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I know you
I'm not a stranger

Frequently asked questions: I know you vs I'm not a stranger

What's the difference between I know you and I'm not a stranger?

I know you: I understand what you are saying or feeling. I'm not a stranger: I don't know you.

Which is more common: I know you and I'm not a stranger?

I know you is the most common in everyday English.

Can you show an example of each?

I know you: When I saw her across the room, I smiled and said, 'I know you!' I'm not a stranger: When I saw her again, I smiled and said, 'I'm not a stranger.'

Can I use I know you and I'm not a stranger interchangeably?

Not always. I know you and I'm not a stranger 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.