| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [prep] | 1917 |
|
| 2 | had been [prep] [noun sg] | 795 |
|
| 3 | been [v-ing] [prep] [noun sg] | 504 |
|
| 4 | had been [v-ing] [noun sg] | 233 |
|
