| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult for them [to-vb] | 27 |
|
| 2 | [be] difficult for them [verb] | 27 |
|
| 3 | be difficult for them [verb] | 27 |
|
| 4 | [is] difficult for them [verb] | 12 |
|
| 5 | is difficult for them [verb] | 12 |
|
| 6 | [be] difficult for them [verb] | 9 |
|
| 7 | be difficult for them [verb] | 9 |
|
| 8 | [was/were] difficult for them [verb] | 5 |
|
| 9 | was difficult for them [verb] | 5 |
|
