| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [to-vb] [adj] [noun pl] | 63 |
|
| 2 | is [to-vb] that [adj] [noun pl] | 36 |
|
| 3 | is necessary [to-vb] that [adj] | 13 |
|
| 4 | necessary [to-vb] that [adj] [noun pl] | 12 |
|
