| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [verb] for [art] | 172 |
|
| 2 | should be [vb pp] for [art] | 156 |
|
| 3 | [modal v] be used for [art] | 116 |
|
| 4 | should be used [prep] [art] | 64 |
|
| 5 | should [be] used for [art] | 14 |
|
| 6 | should be used for [art] | 14 |
|
| 7 | should be use for [art] | 14 |
|
