| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | necessary ensure that [adj] [noun] | 11 |
|
| 2 | necessary to ensure that [adj] [noun] | 11 |
|
| 3 | necessary ensure that [adj] [noun pl] | 8 |
|
| 4 | necessary ensure that [adj] [noun] | 6 |
|
| 5 | necessary ensure that [det] [noun] | 5 |
|
