| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [be] [v-ing] to | 507 |
|
| 2 | must have [be] [v-ing] | 289 |
|
| 3 | must [be] [v-ing] to | 30 |
|
| 4 | must have [be] to | 8 |
|
