| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [noun] | 490 |
|
| 2 | had been [v-ing] on | 185 |
|
| 3 | had been on [noun] | 116 |
|
| 4 | been [v-ing] on [noun] | 109 |
|
