| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] on a | 108 |
|
| 2 | [verb] been work on a | 28 |
|
| 3 | have been work on a | 28 |
|
| 4 | had been work [prep] a | 25 |
|
| 5 | had been work on [art] | 22 |
|
| 6 | [vb past] been work on a | 9 |
|
| 7 | had [be] work on a | 8 |
|
| 8 | had be work on a | 8 |
|
| 9 | had [been] work on a | 8 |
|
