| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] it [adj] | 1902 |
|
| 2 | [verb] it difficult | 1488 |
|
| 3 | [vb -s] it [adj] | 1319 |
|
| 4 | [vb -s] [pron] difficult | 214 |
|
| 5 | [vb -s] it difficult | 203 |
|
