| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to ensure that [pron] is [vb pp] | 25 |
|
| 2 | to ensure [that] it is [vb pp] | 18 |
|
| 3 | to ensure [that] [pers pn] is [vb pp] | 18 |
|
| 4 | to ensure [that] it is [vb pp] | 18 |
|
| 5 | to ensure [that] [indef pn] is [vb pp] | 5 |
|
