| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [pron] had be [v-ing] on | 9 |
|
| 2 | [subord] [pron] had been [v-ing] on | 9 |
|
| 3 | [subord] [pron] had [been] [v-ing] on | 9 |
|
| 4 | [subord] [pers pn] had [be] [v-ing] on | 8 |
|
