| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [be] [prep] | 294 |
|
| 2 | there must have [be] | 264 |
|
| 3 | there have [be] [prep] | 143 |
|
| 4 | there must [be] [prep] | 33 |
|
