| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been working on | 47 |
|
| 2 | had been working on | 16 |
|
| 3 | 've been working on | 13 |
|
| 4 | have been working on | 7 |
|
| 5 | has been working on | 6 |
|
