| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it [be] [adj] for | 307 |
|
| 2 | [conj] it [be] difficult for | 63 |
|
| 3 | [coord] it [be] difficult [prep] | 41 |
|
| 4 | [coord] [pron] [be] difficult for | 20 |
|
