| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] ensure that [det] [noun] | 6 |
|
| 2 | [is] [verb] to ensure that [det] [noun] | 6 |
|
| 3 | [is] [vb pp] ensure that [det] [noun] | 5 |
|
