| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [verb] [art] | 1072 |
|
| 2 | should [vb infin] [vb pp] [art] | 583 |
|
| 3 | [modal v] [vb infin] used [art] | 46 |
|
| 4 | should [vb infin] use [art] | 20 |
|
| 5 | should [verb] used [art] | 6 |
|
