| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | serve [prep] a [adj] [noun sg] | 73 |
|
| 2 | serve as a [adj] [noun] | 70 |
|
| 3 | serve [prep] a [adj] [noun] | 64 |
|
| 4 | serve [prep] a useful [noun] | 18 |
|
| 5 | serve [prep] an [adj] [noun] | 9 |
|
