| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [vb pp] [det] | 243 |
|
| 2 | should [vb infin] [vb pp] a | 197 |
|
| 3 | [vb infin] [vb pp] a [det] | 61 |
|
| 4 | should [vb infin] a [det] | 20 |
|
