| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be used with caution | 9 |
|
| 2 | [vb mod] be used with caution | 9 |
|
| 3 | should be used with caution | 6 |
|
| 4 | should be used with caution | 6 |
|
