| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] who had been [prep] | 163 |
|
| 2 | [noun] had been working [prep] | 55 |
|
| 3 | who had been working [prep] | 12 |
|
| 4 | [noun] who had been working | 7 |
|
