| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | necessary [verb] that [adj] | 30 |
|
| 2 | necessary [to-vb] that [adj] | 27 |
|
| 3 | necessary [verb] that [det] | 19 |
|
| 4 | necessary ensure that [adj] | 16 |
|
| 5 | necessary to ensure that [adj] | 15 |
|
| 6 | necessary [verb] that [adj] | 9 |
|
| 7 | necessary [verb] that this | 6 |
|
| 8 | necessary [verb] that this | 6 |
|
