| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [adv] been | 7224 |
|
| 2 | had been [v-ing] | 5819 |
|
| 3 | [adv] been [v-ing] | 1167 |
|
| 4 | had [adv] [v-ing] | 23 |
|
