| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they had been [verb] | 1206 |
|
| 2 | they had been [v-ing] | 294 |
|
| 3 | [pron] had been working | 133 |
|
| 4 | [pers pn] had been working | 113 |
|
| 5 | they [verb] been working | 34 |
|
| 6 | they have been working | 34 |
|
| 7 | they had been work | 14 |
|
| 8 | they had [be] working | 13 |
|
| 9 | they had been working | 13 |
|
| 10 | they had [been] working | 13 |
|
| 11 | they had be working | 13 |
|
| 12 | they [vb past] been working | 13 |
|
