| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [that] [art] [noun] | 5599 |
|
| 2 | difficult [to-vb] [art] [noun] | 852 |
|
| 3 | difficult [to-vb] [that] [art] | 88 |
|
| 4 | difficult [to-vb] [that] [noun] | 40 |
|
