| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] [verb] whether [det] | 20 |
|
| 2 | it is [adj] [to-vb] whether [det] | 20 |
|
| 3 | it is [adj] [verb] whether [det] | 20 |
|
| 4 | it is [adj] [verb] whether this | 13 |
|
| 5 | it is difficult [verb] whether [det] | 9 |
|
| 6 | it is difficult [verb] whether [det] | 9 |
|
| 7 | it is [adj] to say whether [det] | 5 |
|
| 8 | it is [adj] say whether [det] | 5 |
|
| 9 | it is impossible [verb] whether [det] | 5 |
|
| 10 | it is impossible [verb] whether [det] | 5 |
|
| 11 | it is [adj] to know whether [det] | 5 |
|
| 12 | it is [adj] know whether [det] | 5 |
|
