| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [to-vb] [adv] how | 91 |
|
| 2 | [adj] [to-vb] [adv] how | 88 |
|
| 3 | difficult [to-vb] [adv] [adv] | 52 |
|
| 4 | difficult [to-vb] [adv] how | 24 |
|
| 5 | difficult [verb] [adv] how | 23 |
|
| 6 | difficult [to-vb] [adv] how | 23 |
|
