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Responding to what someone has said

Do you?/Are you?/Is it? (the appropriate question tag from the statement)

That´s interesting.

Really?

I see.

Oh, OK.

Playing for time

Let me see,...

Well, let me think,...

Hm, let me think about that for a moment...

I´ll have to think about it.

How shall/can I put it?

What´s the word for it?

Asking for clarification/Saying you don´t understand

Pardon?

Sorry?

Sorry, I didn´t quite catch that.

Sorry, I missed that.

Do you mean...?

Does this mean...?

Can you say it/that again, please?

Would you mind repeating that, please?

Could you repeat that more slowly, please?

Could you spell that, please?