| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [prep] a | 12460 |
|
| 2 | [prep] a certain | 2218 |
|
| 3 | [vb base] a certain | 240 |
|
| 4 | [vb base] [prep] certain | 120 |
|
