| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] had [been] [v-ing] [prep] | 133 |
|
| 2 | had [been] [v-ing] on [prep] | 58 |
|
| 3 | [noun pl] had [been] [v-ing] on | 9 |
|
