| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [prep] [noun] | 400 |
|
| 2 | had been [v-ing] [prep] [det] | 127 |
|
| 3 | been [v-ing] [prep] [noun] [det] | 26 |
|
| 4 | had been [prep] [noun] [det] | 13 |
|
