| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] it difficult for | 41 |
|
| 2 | [vb -s] [vb pp] it for | 35 |
|
| 3 | [vb -s] [vb pp] it difficult | 18 |
|
| 4 | [vb pp] it difficult for | 14 |
|
