| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [vb pp] a | 197 |
|
| 2 | [vb infin] [vb pp] a [adj -er] | 163 |
|
| 3 | should [vb infin] a [adj -er] | 59 |
|
| 4 | should [vb infin] [vb pp] [adj -er] | 12 |
|
