| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [vb past] been work at | 8 |
|
| 2 | [pers pn] [vb past] be work at | 8 |
|
| 3 | [pron] [vb past] be working at | 7 |
|
| 4 | [pron] had be work at | 6 |
|
