| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] difficult to say | 30 |
|
| 2 | is [adv] difficult to say | 19 |
|
| 3 | be very difficult to say | 13 |
|
| 4 | be very difficult to say | 13 |
|
| 5 | 's [adv] difficult to say | 10 |
|
