| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [v-ing] [noun] | 490 |
|
| 2 | [been] [v-ing] [det] [noun] | 447 |
|
| 3 | had [been] [det] [noun] | 265 |
|
| 4 | had [been] [v-ing] [det] | 175 |
|
