| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [n mass] who should [vb infin] | 6 |
|
| 2 | [prep] [n mass] who should [vb infin] | 6 |
|
| 3 | [n mass] who should [vb infin] [vb pp] | 5 |
|
| 4 | [n mass] who should [vb infin] [verb] | 5 |
|
