| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh det] [modal v] [be] difficult | 18 |
|
| 2 | [noun sg] [Wh det] [modal v] [be] difficult | 11 |
|
| 3 | [noun pl] [Wh det] [modal v] [be] difficult | 6 |
|
| 4 | [Wh det] it [modal v] [be] difficult | 6 |
|
| 5 | [Wh det] [pron] [modal v] [be] difficult | 6 |
|
| 6 | [Wh det] [pers pn] [modal v] [be] difficult | 6 |
|
| 7 | [Wh det] it [modal v] [be] difficult | 6 |
|
| 8 | [Wh det] [modal v] [be] [adv] difficult | 11 |
|
| 9 | [Wh det] [modal v] [be] [adv] difficult | 11 |
|
| 10 | [Wh det] [modal v] [be] difficult [to-vb] | 37 |
|
| 11 | [Wh det] [modal v] [be] difficult [verb] | 37 |
|
