| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been working at | 41 |
|
| 2 | had be working at | 18 |
|
| 3 | 've be working at | 7 |
|
| 4 | has be working at | 6 |
|
| 5 | have be working at | 5 |
|
