| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] had been working on the | 9 |
|
| 2 | [noun] had been working on the | 5 |
|
| 3 | had been working on the [noun] | 13 |
|
| 4 | had been working on the [noun sg] | 10 |
|
