| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have worked | 305 |
|
| 2 | who [vb past] worked | 143 |
|
| 3 | who had worked | 136 |
|
| 4 | who [vb base] worked | 93 |
|
| 5 | who have worked | 74 |
|
| 6 | who [vb -s] worked | 69 |
|
| 7 | who has worked | 66 |
|
| 8 | who 've worked | 19 |
|
| 9 | who 'd worked | 7 |
|
