| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [noun] | 490 |
|
| 2 | had been [v-ing] at | 148 |
|
| 3 | had been at [noun] | 148 |
|
| 4 | been [v-ing] at [noun] | 113 |
|
