It’s on the tip of my tongue.
→  생각이날듯한데 안나네.

[예문]
M: Hey, do you remember the name of that guy who we just talked to about ?
  야, 너 방금 얘기했던 사람 이름 기억나?

W: Wait, it’s on the tip of my tongue. Oh, what was his name?
  잠깐만, 생각이 날 듯한 데 안 나네. 이름이 뭐더라?

M: What’s our problem anyway? We just talked to him an hour ago.
   도대체 우리 왜 이러지? 우리 그 사람이랑 한 시간 전에 얘기했잖아.

W: I got it. It’s Tom, Tom Johnson.
   생각났다. Tom, Tom Johnson이야.