| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] on | 1091 |
|
| 2 | had been [v-ing] on | 185 |
|
| 3 | had been [verb] [v-ing] | 166 |
|
| 4 | had [verb] [v-ing] on | 24 |
|
| 5 | been [verb] [v-ing] on | 11 |
|
