| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [pron] [modal v] have [be] [prep] | 27 |
|
| 2 | [pron] [pron] must have [be] [prep] | 17 |
|
| 3 | what [pron] must [verb] [be] [prep] | 15 |
|
| 4 | what [pron] must have [be] [prep] | 15 |
|
