| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have been difficult for | 18 |
|
| 2 | it [vb mod] have been difficult for | 18 |
|
| 3 | [pers pn] [vb mod] have been difficult for | 18 |
|
| 4 | [pron] [vb mod] have been difficult for | 18 |
|
| 5 | [vb mod] have been difficult for [art] | 9 |
|
| 6 | [vb mod] have been difficult for [art] | 9 |
|
| 7 | [vb mod] have been difficult for the | 7 |
|
| 8 | [vb mod] have been difficult for [pron] | 7 |
|
| 9 | [vb mod] have been difficult for the | 7 |
|
| 10 | [vb mod] have been difficult for [pers pn] | 5 |
|
