| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it is difficult for | 44 |
|
| 2 | [that] it is difficult for | 16 |
|
| 3 | that it is difficult for | 16 |
|
| 4 | that it is difficult for | 16 |
|
| 5 | [coord] it is difficult for | 15 |
|
| 6 | [subord] it is difficult for | 13 |
|
| 7 | and it is difficult for | 11 |
|
| 8 | and it is difficult for | 11 |
|
