| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pers pn] more difficult | 28 |
|
| 2 | [vb past] it more difficult | 26 |
|
| 3 | made [pers pn] more difficult | 17 |
|
| 4 | found [pers pn] more difficult | 11 |
|
