| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been work [prep] a | 13 |
|
| 2 | have been working [prep] a | 12 |
|
| 3 | have been work [prep] a | 12 |
|
| 4 | have been work on a | 7 |
|
| 5 | have been work on a | 7 |
|
