| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [vb mod] be difficult for them | 6 |
|
| 2 | [pron] [modal v] be difficult for them | 6 |
|
| 3 | [pron] be [adv] difficult for them | 13 |
|
| 4 | [pron] be [adv] difficult for them | 13 |
|
| 5 | [pron] be very difficult for them | 8 |
|
| 6 | [pron] be very difficult for them | 8 |
|
| 7 | [pron] be difficult for them [to-vb] | 15 |
|
| 8 | [pron] be difficult for them [verb] | 15 |
|
