| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult it [modal v] [be] for | 6 |
|
| 2 | how difficult it [modal v] [be] for | 5 |
|
| 3 | how difficult it [modal v] [be] for | 5 |
|
| 4 | [Wh adv] difficult it [modal v] [be] for | 5 |
|
