| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [vb mod] have been [prep] | 693 |
|
| 2 | [pron] [vb mod] have been difficult | 49 |
|
| 3 | [vb mod] have been difficult [prep] | 22 |
|
| 4 | [pron] have been difficult [prep] | 6 |
|
