| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been a [noun sg] | 795 |
|
| 2 | have been a difficult [noun sg] | 24 |
|
| 3 | [modal v] have been a difficult | 5 |
|
| 4 | [modal v] have a difficult [noun sg] | 5 |
|
