| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what you should [verb] is | 13 |
|
| 2 | what you should [vb infin] [is] | 13 |
|
| 3 | what you should do [is] | 8 |
|
| 4 | what you should do [is] | 8 |
|
