| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [vb mod] to be | 186 |
|
| 2 | what [vb mod] to [be] | 186 |
|
| 3 | what used to [be] | 139 |
|
| 4 | what ought to [be] | 46 |
|
