| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [vb past] as [noun] | 74 |
|
| 2 | [vb past] serve as [noun] | 32 |
|
| 3 | [Wh pn] [vb past] serve as | 23 |
|
| 4 | [Wh pn] serve as [noun] | 13 |
|
