| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [prep] | 5559 |
|
| 2 | should [vb infin] [be] | 2037 |
|
| 3 | [vb infin] [be] [prep] | 1772 |
|
| 4 | should [be] [prep] | 1402 |
|
