| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been working for | 66 |
|
| 2 | had been working for | 24 |
|
| 3 | has been working for | 15 |
|
| 4 | have been working for | 9 |
|
| 5 | 's been working for | 8 |
|
| 6 | 've been working for | 6 |
|
