| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [vb pp] a | 11155 |
|
| 2 | [vb -s] a problem | 190 |
|
| 3 | [vb pp] a problem | 176 |
|
| 4 | [vb -s] [vb pp] problem | 41 |
|
