| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh pn] had [been] [v-ing] | 189 |
|
| 2 | [noun] had [been] [v-ing] for | 186 |
|
| 3 | [Wh pn] had [been] [v-ing] for | 29 |
|
