| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it is [adj] | 3526 |
|
| 2 | [conj] it is difficult | 483 |
|
| 3 | [coord] it be difficult | 343 |
|
| 4 | [coord] it [be] difficult | 343 |
|
| 5 | [coord] it [is] difficult | 260 |
|
| 6 | [coord] [pers pn] is difficult | 213 |
|
| 7 | [coord] [pron] is difficult | 213 |
|
| 8 | [coord] it is difficult | 209 |
|
