1. I don't know what's what.

2. You're old enough now to know what's what.

3. You have to know what's what and when to draw the line.

4. She's been working here long enough to know what's what.

5. I keep my ears open and I know what's what around the office.

6. I don't know what's what in this new office.

6. Wish you can benefit from our online sentence dictionary and make progress every day!

7. I'll tell you the moment I know what's what.

8. You've old and pigheaded. You don't know what's what.

9. I can't find it. I don't know what's what in this new office.

10. I guess I'm your auntie and I know what's what.

11. I just want to know what's what and who's who.

12. So I know what's what, because I've seen the other side.

13. I like to think our academic standard's gone up, and we know what's what in the world.

14. Rochester did the wrong thing, because he is new here and doesn't yet know what's what.

15. Richard did the wrong thing, because he is new here and doesn't yet know what's what.

16. At first you are awkward, sometimes calm, sometimes not. You don't really know what's what.