| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [Wh adv] difficult it [be] for | 20 |
|
| 2 | [vb past] [Wh adv] [adj] it [be] for | 15 |
|
| 3 | [vb past] [Wh adv] difficult [pers pn] [be] for | 5 |
|
| 4 | [vb past] [adv] difficult it [be] for | 5 |
|
| 5 | [vb past] [Wh adv] difficult it [be] [prep] | 5 |
|
| 6 | [vb past] [Wh adv] difficult it [be] for | 5 |
|
| 7 | [vb past] [Wh adv] difficult [pron] [be] for | 5 |
|
