| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] | 37993 |
|
| 2 | had been [v-ing] | 5819 |
|
| 3 | [verb] been working | 832 |
|
| 4 | have been working | 832 |
|
| 5 | [vb past] been working | 277 |
|
| 6 | had been work | 255 |
|
| 7 | had be working | 235 |
|
| 8 | had [be] working | 235 |
|
| 9 | had [been] working | 234 |
|
