| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [verb] for | 750 |
|
| 2 | [modal v] be used for | 710 |
|
| 3 | should be [vb pp] for | 686 |
|
| 4 | should be used [prep] | 192 |
|
| 5 | should be used [prep] | 192 |
|
| 6 | should be use for | 64 |
|
| 7 | should be used for | 63 |
|
| 8 | should [be] used for | 63 |
|
