| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adj] [to-vb] | 96221 |
|
| 2 | be [adj] [to-vb] | 92017 |
|
| 3 | be difficult [verb] | 3975 |
|
| 4 | [be] difficult [to-vb] | 3945 |
|
| 5 | be difficult [to-vb] | 3945 |
|
