| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [verb] [prep] | 9907 |
|
| 2 | should be [vb pp] [prep] | 9543 |
|
| 3 | [modal v] be used [prep] | 2697 |
|
| 4 | should be use [prep] | 193 |
|
| 5 | should be used [prep] | 192 |
|
| 6 | should [be] used [prep] | 192 |
|
