| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have helped | 127 |
|
| 2 | [Wh pn] had helped | 72 |
|
| 3 | [Wh pn] have helped | 24 |
|
| 4 | [Wh pn] has helped | 15 |
|
| 5 | [Wh pn] 'd helped | 9 |
|
| 6 | [Wh pn] 've helped | 5 |
|
