| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] been difficult [prep] the | 8 |
|
| 2 | [vb mod] have [been] difficult [prep] the | 8 |
|
| 3 | [vb mod] have [been] difficult [prep] the | 8 |
|
| 4 | [vb mod] [verb] [been] difficult [prep] the | 8 |
|
| 5 | [vb mod] [vb infin] [been] difficult [prep] the | 8 |
|
| 6 | [vb mod] [verb] [been] difficult for the | 7 |
|
| 7 | would [verb] [been] difficult [prep] the | 6 |
|
