| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who was [num] at the time | 8 |
|
| 2 | who [be] [num] at the time | 8 |
|
| 3 | who [be] [num] at the time | 8 |
|
| 4 | who be [num] at the time | 8 |
|
| 5 | who [was/were] [num] at the time | 8 |
|
