| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it should be [vb pp] | 2131 |
|
| 2 | it should be [adj] | 596 |
|
| 3 | it be [vb pp] [adj] | 572 |
|
| 4 | should be [vb pp] [adj] | 426 |
|
