| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [to-vb] at this | 55 |
|
| 2 | [adj] [to-vb] at this | 53 |
|
| 3 | difficult [to-vb] [prep] this | 37 |
|
| 4 | difficult [to-vb] [prep] this | 37 |
|
| 5 | difficult [to-vb] at [adj] | 25 |
|
| 6 | difficult [to-vb] at [det] | 16 |
|
| 7 | difficult [to-vb] at this | 9 |
|
| 8 | difficult [to-vb] at this | 9 |
|
| 9 | difficult [to-vb] at this | 9 |
|
| 10 | difficult [verb] at this | 9 |
|
