
But this is just biology,
so I'm SURE it's no problem
The Big Bang Theory Season 5, Episode 16

and I'm not even SURE
you think of me as a friend.
The Big Bang Theory Season 10, Episode 6

You SURE. Not even coffee?
The Big Bang Theory Season 7, Episode 22

I'm not even SURE what the last one means,
but it's another word and I know it.
The Big Bang Theory Season 9, Episode 18

Oh, no. Are you SURE you don't wanna
give her a few more minutes?
The Big Bang Theory Season 10, Episode 16