| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] on the | 73 |
|
| 2 | they had been [v-ing] the | 16 |
|
| 3 | they had been on the | 15 |
|
| 4 | they had been [v-ing] on | 10 |
|
