| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [vb infin] a | 2699 |
|
| 2 | [verb] a problem | 1141 |
|
| 3 | [vb infin] a problem | 203 |
|
| 4 | [verb] [vb infin] problem | 40 |
|
