| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been a [adj] | 1333 |
|
| 2 | [vb past] been a [adj] | 1272 |
|
| 3 | [verb] been a difficult | 32 |
|
| 4 | [vb past] [be] a difficult | 11 |
|
| 5 | [vb past] be a difficult | 11 |
|
| 6 | [vb past] been [art] difficult | 10 |
|
| 7 | [vb past] been a difficult | 10 |
|
| 8 | [vb past] been [art] difficult | 10 |
|
| 9 | [vb past] [been] a difficult | 10 |
|
| 10 | [vb past] been a difficult | 10 |
|
