| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] for | 1516 |
|
| 2 | had been [v-ing] for | 496 |
|
| 3 | had been [v-ing] [verb] | 317 |
|
| 4 | been [v-ing] [verb] for | 38 |
|
