| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [verb] at the time | 48 |
|
| 2 | [not/n't] [vb infin] at the time | 40 |
|
| 3 | [not/n't] [vb pp] at the time | 35 |
|
| 4 | n't [verb] at the time | 34 |
|
| 5 | [not/n't] know at the time | 19 |
|
| 6 | [not/n't] know at the time | 14 |
|
| 7 | [not/n't] realise at the time | 9 |
|
| 8 | [not/n't] [v-ing] at the time | 7 |
|
| 9 | [not/n't] realise at the time | 7 |
|
