| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult say [pron] | 7 |
|
| 2 | it is difficult to say [pron] | 7 |
|
| 3 | it is difficult say [Wh det] | 7 |
|
| 4 | it is difficult say what | 5 |
|
| 5 | it is difficult say what | 5 |
|
