| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [prep] | 9543 |
|
| 2 | always be [vb pp] [prep] | 663 |
|
| 3 | should always be [vb pp] | 213 |
|
| 4 | should always be [prep] | 27 |
|
