| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is difficult [to-vb] that | 97 |
|
| 2 | [pron] is not [to-vb] that | 29 |
|
| 3 | [pron] is difficult not [to-vb] | 28 |
|
| 4 | is difficult not [to-vb] that | 7 |
|
