| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it was difficult [to-vb] [adj] [noun pl] | 15 |
|
| 2 | it was difficult [to-vb] [adj] [noun pl] | 9 |
|
| 3 | it was difficult [to-vb] [det] [noun pl] | 5 |
|
