| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who had been [v-ing] [prep] | 160 |
|
| 2 | people who had been [prep] | 21 |
|
| 3 | people who had been [v-ing] | 10 |
|
| 4 | people had been [v-ing] [prep] | 9 |
|
