| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [been] [prep] | 4108 |
|
| 2 | [been] working [prep] | 542 |
|
| 3 | [vb past] [been] working | 277 |
|
| 4 | [vb past] working [prep] | 152 |
|
