| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | do [adv] know at the time | 13 |
|
| 2 | do [adv] know at the time | 13 |
|
| 3 | do not know at the time | 13 |
|
| 4 | do [not/n't] know at the time | 13 |
|
| 5 | did [adv] know at the time | 11 |
|
| 6 | do n't know at the time | 11 |
|
