| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [verb] a | 2320 |
|
| 2 | should [vb infin] a | 2319 |
|
| 3 | [modal v] use a | 337 |
|
| 4 | should use [art] | 82 |
|
| 5 | should use [art] | 82 |
|
| 6 | should use a | 29 |
|
| 7 | should use a | 24 |
|
