| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [not/n't] there at the time | 6 |
|
| 2 | [be] [not/n't] there at the time | 6 |
|
| 3 | be [not/n't] there at the time | 6 |
|
| 4 | was [not/n't] there at the time | 5 |
|
