| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] they should [adv] [vb infin] | 9 |
|
| 2 | [vb past] they should [adv] [vb infin] | 9 |
|
| 3 | [vb past] they should not [vb infin] | 5 |
|
| 4 | [vb past] they should [not/n't] [vb infin] | 5 |
|
