There are a lot of common phrases and slang that we use daily. Here are a few I thought would be useful to use in your next English conversation.
What was that?
なんでした?
I didn't catch that.
聞き取れませんでした。
You're kidding!
冗談でしょう!
No way!
まさか!
信じられない!
ありえない!
まじで!
Don't you think so? Yeah, I think so.
そう思わない?はい、そう思います。
I'm sure of it.
そう確信しています。
絶対にそうだと思います。