| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult [to-vb] [adv] [Wh adv] | 19 |
|
| 2 | [be] difficult [to-vb] [adv] [Wh adv] | 19 |
|
| 3 | [is] difficult [to-vb] [adv] [Wh adv] | 16 |
|
| 4 | is difficult [to-vb] [adv] [Wh adv] | 10 |
|
| 5 | 's difficult [to-vb] [adv] [Wh adv] | 6 |
|
| 6 | [adv] difficult [to-vb] [adv] [Wh adv] | 6 |
|
| 7 | [adv] difficult [to-vb] [adv] [Wh adv] | 5 |
|
| 8 | difficult [to-vb] [adv] [Wh adv] [adj] | 14 |
|
| 9 | difficult [to-vb] [adv] [Wh adv] [det] | 7 |
|
| 10 | difficult [to-vb] [adv] [Wh adv] [adj] | 7 |
|
| 11 | difficult [to-vb] [adv] [Wh adv] [to-vb] | 5 |
|
| 12 | difficult [to-vb] [adv] [Wh adv] [verb] | 5 |
|
| 13 | difficult [to-vb] [adv] [Wh adv] [art] | 5 |
|
| 14 | difficult [to-vb] [adv] [Wh adv] [art] | 5 |
|
