| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] at [art] | 115 |
|
| 2 | [vb infin] at [art] same | 115 |
|
| 3 | should [vb infin] [art] same | 95 |
|
| 4 | should at [art] same | 7 |
|
