| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [verb] [verb] [adv] | 435 |
|
| 2 | should [verb] [vb pp] [adv] | 316 |
|
| 3 | [modal v] [verb] known [adv] | 93 |
|
| 4 | should [verb] know [adv] | 67 |
|
| 5 | should [verb] known [adv] | 66 |
|
