| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adj] | 89695 |
|
| 2 | it be [adj] | 70569 |
|
| 3 | [pron] be difficult | 3170 |
|
| 4 | [pers pn] be difficult | 3043 |
|
| 5 | it be difficult | 2948 |
|
| 6 | it [be] difficult | 2948 |
|
| 7 | it be difficult | 2948 |
|
