| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [be] [adj] [verb] | 5144 |
|
| 2 | [conj] it [be] [adj] [verb] | 4541 |
|
| 3 | [conj] [pron] [be] difficult [verb] | 577 |
|
| 4 | [conj] it [be] difficult [verb] | 551 |
|
