| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] | 38935 |
|
| 2 | it [be] hard | 1928 |
|
| 3 | it be hard | 1928 |
|
| 4 | it [is] hard | 1461 |
|
| 5 | [pron] is hard | 892 |
|
