| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [is] [adv] difficult | 1372 |
|
| 2 | [pron] [is] difficult to say | 69 |
|
| 3 | [pron] [is] [adv] to say | 52 |
|
| 4 | [is] [adv] difficult to say | 29 |
|
