| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adv] impossible to say | 13 |
|
| 2 | be [adv] impossible to say | 13 |
|
| 3 | [is] [adv] impossible to say | 10 |
|
| 4 | is [adv] impossible to say | 8 |
|
| 5 | [adv] impossible to say [conj] | 5 |
|
