| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [noun] [Wh pn] | 448 |
|
| 2 | on a [noun] [noun] [pron] | 184 |
|
| 3 | on [art] [noun] [noun] [Wh pn] | 34 |
|
