| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] been difficult for | 20 |
|
| 2 | [modal v] [vb infin] been difficult for | 20 |
|
| 3 | would [vb infin] been difficult for | 14 |
|
| 4 | would [vb infin] been difficult for | 14 |
|
| 5 | [vb infin] been difficult for [art] | 9 |
|
| 6 | [vb infin] been difficult for [art] | 9 |
|
| 7 | [vb infin] been difficult for the | 7 |
|
| 8 | [vb infin] been difficult for [pron] | 7 |
|
| 9 | [vb infin] been difficult for the | 7 |
|
| 10 | [vb infin] been difficult for [pers pn] | 5 |
|
