| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it should have [vb pp] | 124 |
|
| 2 | it should have done | 23 |
|
| 3 | it should have gone | 10 |
|
| 4 | it should have had | 8 |
|
| 5 | it should have come | 8 |
|
| 6 | it should have taken | 6 |
|
| 7 | it should have read | 6 |
|
| 8 | it should have become | 5 |
|
