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