| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been work on | 50 |
|
| 2 | have [been] working on | 47 |
|
| 3 | had [been] work on | 16 |
|
| 4 | 've [been] work on | 13 |
|
| 5 | have [been] work on | 8 |
|
| 6 | has [been] work on | 7 |
|
