| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have been difficult [prep] | 20 |
|
| 2 | [pron] [vb mod] have been difficult [prep] | 20 |
|
| 3 | it [vb mod] have been difficult [prep] | 20 |
|
| 4 | [pron] [vb mod] have been difficult [prep] | 20 |
|
| 5 | [pers pn] [vb mod] have been difficult [prep] | 20 |
|
| 6 | [pron] [vb mod] have been difficult for | 18 |
|
| 7 | [pron] [vb mod] have been difficult for | 18 |
|
| 8 | [pron] would have been difficult [prep] | 14 |
|
