| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [prep] | 1917 |
|
| 2 | been [v-ing] [prep] this | 154 |
|
| 3 | had been [v-ing] this | 25 |
|
| 4 | had been [prep] this | 17 |
|
