| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [verb] | 6471 |
|
| 2 | should [vb infin] [to-vb] | 1760 |
|
| 3 | [modal v] [vb infin] to ask | 345 |
|
| 4 | should [vb infin] ask | 62 |
|
| 5 | should [verb] to ask | 18 |
|
