| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb base] [prep] a | 835 |
|
| 2 | [vb base] [prep] a certain | 53 |
|
| 3 | they [vb base] a certain | 31 |
|
| 4 | they [vb base] [prep] certain | 17 |
|
| 5 | they [prep] a certain | 12 |
|
