| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [v-ing] [prep] [noun] | 400 |
|
| 2 | [been] [v-ing] [prep] [noun] in | 48 |
|
| 3 | had [been] [prep] [noun] in | 46 |
|
| 4 | had [been] [v-ing] [noun] in | 19 |
|
