| 100% | YET | 3 | "I haven't decided ___" ("I'll let you know later") |
| 61% | TBA | 3 | "We'll let you know later" |
| 60% | TBA | 3 | "We'll let you know later" letters |
| 57% | AREA | 4 | "I'll let you know next time I'm in the ___!" |
| 57% | YET | 3 | "I haven't decided ___" ("Ask me later") |
| 51% | ICANT | 5 | "I'll let you know if ___ make it on time.": 2 wds. |
| 48% | SUMMER | 6 | I Know What You Did Last __; teen horror flick |
| 46% | BESAFE | 6 | "Don't drive too fast and let me know when you get there" |
| 46% | SUMMER | 6 | 1997 slasher flick, I Know What You Did Last __ |
| 46% | TBA | 3 | "We'll let you know," on skeds |
| 45% | SEEN | 4 | Cher "You Haven't ___ the Last of Me"") |
| 45% | AGES | 4 | I haven't seen you for ___ |
| 45% | WEMET | 5 | "Haven't ___ before?" ("Don't I know you?") (2 wds.) |
| 44% | TBA | 3 | Letters on a schedule meaning "We'll let you know" |
| 44% | LASTCALL | 8 | "If you want one, let me know now!" |
| 43% | NERVEENDINGS | 12 | They'll let you know when you're in hot water |
| 42% | IOU | 3 | "Let me pay you back later" letters |
| 42% | WHO | 3 | "Don't you know ___ I am?!" |
| 42% | ILL | 3 | "__ let you know" |
| 42% | ILL | 3 | "___ let you know" |
| 42% | HERESWHO | 8 | "Want to know the culprit? I'll tell you!" |
| 42% | YET | 3 | "I haven't decided ___" |
| 42% | MAYBEYESMAYBENO | 15 | "I haven't decided" |
| 41% | ILL | 3 | "___ let you know what happens" |
| 40% | LOVE | 4 | "I Know What You Did Last Summer" actress Jennifer ___ Hewitt |
| 40% | IGGYPOP | 7 | Candy, Candy, Candy, I can't let you go! |
| 40% | IOU | 3 | "Let me repay you later" letters |
| 40% | DID | 3 | "I Know What You ___ Last Summer" |
| 40% | ILL | 3 | "___ have to let you know" |
| 40% | CANTI | 5 | "Won't you let me?" |