| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] how [pers pn] | 41 |
|
| 2 | difficult to see [Wh adv] [pers pn] | 34 |
|
| 3 | difficult [to-vb] [Wh adv] they | 24 |
|
| 4 | difficult [to-vb] [Wh adv] it | 21 |
|
| 5 | difficult [to-vb] why [pers pn] | 19 |
|
| 6 | difficult [to-vb] [Wh adv] he | 12 |
|
| 7 | difficult to understand [Wh adv] [pers pn] | 10 |
|
| 8 | difficult [to-vb] [Wh adv] you | 9 |
|
| 9 | difficult [to-vb] where [pers pn] | 9 |
|
| 10 | difficult [to-vb] when [pers pn] | 7 |
|
| 11 | difficult [to-vb] [Wh adv] we | 7 |
|
| 12 | difficult to know [Wh adv] [pers pn] | 7 |
|
| 13 | difficult to explain [Wh adv] [pers pn] | 5 |
|
