| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [adv] | 861 |
|
| 2 | had been [v-ing] on | 185 |
|
| 3 | been [v-ing] [adv] on | 87 |
|
| 4 | had been [adv] on | 33 |
|
