| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what [pron] should [vb infin] | 73 |
|
| 2 | [prep] [pron] should [vb infin] [been] | 37 |
|
| 3 | [prep] what should [vb infin] [been] | 26 |
|
| 4 | what [pron] should [vb infin] [been] | 12 |
|
