| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] [verb] at the time | 82 |
|
| 2 | [not/n't] [vb infin] at the time | 40 |
|
| 3 | [not/n't] know at the [noun] | 21 |
|
| 4 | [not/n't] know at the time | 19 |
|
| 5 | [adv] know at the time | 15 |
|
| 6 | [not/n't] know at [art] time | 14 |
|
| 7 | [not/n't] know [prep] the time | 14 |
|
