| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] at the same time | 318 |
|
| 2 | [was/were] [vb pp] at the time | 141 |
|
| 3 | [was/were] [vb pp] at the same | 71 |
|
| 4 | [was/were] at the same time | 36 |
|
