| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] serve as | 278 |
|
| 2 | [Wh det] serve as | 88 |
|
| 3 | [Wh det] [pron] serve | 61 |
|
| 4 | [Wh det] [pron] as | 29 |
|
