| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have been [prep] [noun] at | 9 |
|
| 2 | [Wh pn] have been [prep] [noun sg] at | 8 |
|
| 3 | [Wh pn] have been on [noun] at | 7 |
|
| 4 | [Wh pn] has been [prep] [noun] at | 5 |
|
