| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is difficult [verb] | 1559 |
|
| 2 | [pron] is sometimes [verb] | 268 |
|
| 3 | [pron] is sometimes difficult | 30 |
|
| 4 | is sometimes difficult [verb] | 26 |
|
