Use These Expression When You Feel Stuck In English

01. Great question. Let me think about that for a moment.

02. You know, I've never thought about that. Let me think.

03. Huh. I'm not sure. Let me think for a moment and get back to you.

04. You know I'm not sure. What about you?

05. Oh! I lost the word. It's on the tip of my tongue.