| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [vb infin] [det] [noun] | 60 |
|
| 2 | [verb] [vb infin] [det] problem | 22 |
|
| 3 | [to-vb] [verb] [det] problem | 21 |
|
| 4 | [to-vb] [vb infin] [adj] problem | 8 |
|
