| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [pron] is [prep] | 703 |
|
| 2 | [adv] difficult [pron] is | 109 |
|
| 3 | difficult [pron] is [prep] | 26 |
|
| 4 | [adv] difficult [pron] [prep] | 8 |
|
