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1. When zou can't/ don't hear what a person says:

Sorry?

Pardon?

Excuse me?

What? (for Surprise or Shock)

2. Giving / handing sth to a person:

Here you are.

Here you go.

There you are.

There you go.

3. As an answer to thank you:

You're welcome.

Don't mention it.

Not at all.

4. Request / asking someone to do sth:

Could you please like my video?