| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what they should [vb infin] | 67 |
|
| 2 | what they should do | 28 |
|
| 3 | what they should do | 28 |
|
| 4 | what they should have | 6 |
|
| 5 | what they should have | 5 |
|
