| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [verb] [art] | 6890 |
|
| 2 | should [vb infin] [art] | 6887 |
|
| 3 | [modal v] use [art] | 1290 |
|
| 4 | should use [art] | 82 |
|
