| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [adv] have [verb] | 1015 |
|
| 2 | [vb mod] [adv] have happen | 158 |
|
| 3 | [modal v] [adv] have happen | 158 |
|
| 4 | should [adv] [verb] happen | 28 |
|
| 5 | should [adv] have happen | 27 |
|
