| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know how old | 12 |
|
| 2 | [adv] know how old | 12 |
|
| 3 | [not/n't] know how old | 11 |
|
| 4 | not know how old | 11 |
|
| 5 | n't know how old | 9 |
|
