| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | n't know it at the time | 6 |
|
| 2 | n't know it at the time | 6 |
|
| 3 | n't know it [prep] the time | 6 |
|
| 4 | n't know it [prep] the time | 6 |
|
