| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] a [noun sg] [verb] | 13 |
|
| 2 | must have [vb pp] a [noun] [verb] | 13 |
|
| 3 | must have [verb] a [noun] [to-vb] | 7 |
|
| 4 | must have [verb] a [noun] [v-ing] | 5 |
|
