| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] [adj] to know whether | 12 |
|
| 2 | it be [adv] [adj] know whether | 12 |
|
| 3 | it [is] [adv] [adj] know whether | 10 |
|
| 4 | it is [adv] [adj] know whether | 8 |
|
| 5 | it [be] [adv] difficult know whether | 8 |
|
