| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult to see [Wh adv] [pers pn] could | 11 |
|
| 2 | difficult see [Wh adv] [pers pn] could | 11 |
|
| 3 | difficult see [Wh adv] [pers pn] could | 11 |
|
| 4 | difficult see how [pers pn] could | 10 |
|
| 5 | difficult see [Wh adv] it could | 5 |
|
