| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] who had been [v-ing] | 189 |
|
| 2 | [noun] had been [v-ing] at | 60 |
|
| 3 | [noun] who had been at | 15 |
|
| 4 | who had been [v-ing] at | 6 |
|
