| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] had been [v-ing] | 198 |
|
| 2 | [Wh det] had be [v-ing] | 198 |
|
| 3 | [Wh det] had [been] [v-ing] | 198 |
|
| 4 | which had [be] [v-ing] | 162 |
|
| 5 | what had [be] [v-ing] | 34 |
|
| 6 | [Wh det] had [be] going | 25 |
|
| 7 | [Wh det] had [be] happening | 17 |
|
| 8 | [Wh det] had [be] running | 6 |
|
| 9 | [Wh det] had [be] building | 6 |
|
| 10 | [Wh det] had [be] missing | 5 |
|
