| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [not/n't] know at the time | 14 |
|
| 2 | do [not/n't] know at [art] time | 13 |
|
| 3 | [verb] [not/n't] know at [art] time | 13 |
|
| 4 | [vb past] [not/n't] know at [art] time | 12 |
|
| 5 | [verb] n't know at [art] time | 11 |
|
| 6 | did [not/n't] know at [art] time | 11 |
|
