| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [prep] | 294 |
|
| 2 | must have be [prep] | 294 |
|
| 3 | [modal v] have be about | 18 |
|
| 4 | [vb mod] have be about | 18 |
|
| 5 | must have be about | 10 |
|
| 6 | must have [be] about | 10 |
|
| 7 | must have be about | 10 |
|
| 8 | must [verb] be about | 10 |
|
