| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] how difficult [pers pn] is [prep] | 15 |
|
| 2 | [verb] how difficult it is [prep] | 15 |
|
| 3 | [verb] how difficult [pers pn] is [prep] | 15 |
|
| 4 | [verb] how difficult [pers pn] is for | 13 |
|
| 5 | [vb base] how difficult [pers pn] is [prep] | 8 |
|
| 6 | know how difficult [pers pn] is [prep] | 6 |
|
| 7 | know how difficult [pers pn] is [prep] | 6 |
|
