| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] have been working for | 12 |
|
| 2 | [noun] has been working for | 10 |
|
| 3 | [noun] had been working for | 6 |
|
| 4 | [noun sg] have been working for | 6 |
|
