| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but it [modal v] be difficult for | 5 |
|
| 2 | but it [vb mod] be difficult for | 5 |
|
| 3 | but it be [adv] difficult for | 6 |
|
| 4 | but it be [adv] difficult for | 6 |
|
