| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they had [be] [v-ing] on the | 6 |
|
| 2 | they had be [v-ing] on the | 6 |
|
| 3 | they had [been] [v-ing] on the | 6 |
|
| 4 | they had been [v-ing] on the | 6 |
|
