| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] ensure that | 87 |
|
| 2 | is necessary [verb] that | 51 |
|
| 3 | [be] necessary ensure that | 34 |
|
| 4 | be necessary ensure that | 34 |
|
| 5 | [is] necessary ensure that | 17 |
|
| 6 | is necessary ensure that | 16 |
|
| 7 | is necessary ensure [conj] | 16 |
|
| 8 | is necessary ensure [that] | 16 |
|
