| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult [to-vb] [Wh adv] [adv] | 18 |
|
| 2 | be difficult [to-vb] [Wh adv] [adv] | 18 |
|
| 3 | [is] difficult [to-vb] [Wh adv] [adv] | 16 |
|
| 4 | is difficult [to-vb] [Wh adv] [adv] | 14 |
|
| 5 | [adv] difficult [to-vb] [Wh adv] [adv] | 9 |
|
| 6 | [adv] difficult [to-vb] [Wh adv] [adv] | 6 |
|
| 7 | difficult [to-vb] [Wh adv] [adv] [art] | 8 |
|
| 8 | difficult [to-vb] [Wh adv] [adv] [pers pn] | 8 |
|
| 9 | difficult [to-vb] [Wh adv] [adv] [art] | 8 |
|
| 10 | difficult [to-vb] [Wh adv] [adv] [pron] | 8 |
|
| 11 | difficult [to-vb] [Wh adv] [adv] [adj] | 7 |
|
| 12 | difficult [to-vb] [Wh adv] [adv] [verb] | 6 |
|
| 13 | difficult [to-vb] [Wh adv] [adv] the | 6 |
|
| 14 | difficult [to-vb] [Wh adv] [adv] the | 6 |
|
| 15 | difficult [to-vb] [Wh adv] [adv] [det] | 6 |
|
| 16 | difficult [to-vb] [Wh adv] [adv] [to-vb] | 5 |
|
