| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [verb] [to-vb] that it | 5 |
|
| 2 | should be [vb pp] [to-vb] that it | 5 |
|
| 3 | should be [verb] to ensure that it | 5 |
|
| 4 | should be [verb] [to-vb] that it | 5 |
|
