| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [art] | 625 |
|
| 2 | been [v-ing] on [art] | 254 |
|
| 3 | had been on [art] | 217 |
|
| 4 | had been [v-ing] on | 185 |
|
