| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] and should | 182 |
|
| 2 | can and should | 90 |
|
| 3 | could and should | 67 |
|
| 4 | should and should | 11 |
|
| 5 | may and should | 5 |
|
