| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [pron] is | 5638 |
|
| 2 | difficult [pron] [be] | 165 |
|
| 3 | difficult [pron] be | 165 |
|
| 4 | difficult [pron] [is] | 121 |
|
