| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had be [verb] at the time | 20 |
|
| 2 | had [been] [verb] at the time | 20 |
|
| 3 | had been [verb] at the time | 20 |
|
| 4 | had [be] [vb pp] at the time | 19 |
|
