| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] be [vb pp] | 775 |
|
| 2 | should [vb infin] [vb pp] a | 197 |
|
| 3 | should [vb infin] be a | 147 |
|
| 4 | should be [vb pp] a | 122 |
|
| 5 | [vb infin] be [vb pp] a | 104 |
|
