| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | did [not/n't] know at [art] time | 11 |
|
| 2 | did [adv] know at the time | 11 |
|
| 3 | did not know at [art] time | 11 |
|
| 4 | did n't know at [art] time | 10 |
|
