| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] been waiting | 25 |
|
| 2 | [Wh pn] have been waiting | 25 |
|
| 3 | [Wh pn] [vb past] been waiting | 14 |
|
| 4 | [Wh pn] had been waiting | 13 |
|
| 5 | [Wh pn] [vb base] been waiting | 7 |
|
