| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is [adv] difficult [to-vb] | 729 |
|
| 2 | [pron] is difficult [to-vb] that | 97 |
|
| 3 | [pron] is [adv] [to-vb] that | 40 |
|
| 4 | is [adv] difficult [to-vb] that | 30 |
|
| 5 | [pron] [adv] difficult [to-vb] that | 5 |
|
