| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [vb mod] have been difficult for | 18 |
|
| 2 | [pers pn] [vb mod] [verb] been difficult for | 18 |
|
| 3 | [pron] [vb mod] [vb infin] been difficult for | 18 |
|
| 4 | it [vb mod] [verb] been difficult for | 18 |
|
| 5 | [pron] [vb mod] have been difficult for | 18 |
|
| 6 | it [vb mod] [verb] been difficult for | 18 |
|
| 7 | [pron] would [verb] been difficult for | 12 |
|
