| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [verb] [art] | 30 |
|
| 2 | must have [been] [verb] [art] | 30 |
|
| 3 | must have been [verb] [art] | 30 |
|
| 4 | must have [be] [verb] [art] | 30 |
|
| 5 | must have [be] [verb] [art] | 30 |
|
| 6 | must have [be] [v-ing] [art] | 20 |
|
| 7 | must have [be] [verb] the | 14 |
|
| 8 | must have [be] [verb] a | 13 |
|
| 9 | must have [be] [vb pp] [art] | 10 |
|
