| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] [be] used for | 179 |
|
| 2 | should [adv] [be] used [prep] | 153 |
|
| 3 | should [adv] [be] [verb] for | 127 |
|
| 4 | should [adv] [be] [vb pp] for | 122 |
|
| 5 | should [adv] [be] use for | 23 |
|
