| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] be [v-ing] [det] | 793 |
|
| 2 | must [verb] be [v-ing] | 289 |
|
| 3 | must [verb] be [det] | 100 |
|
| 4 | must be [v-ing] [det] | 18 |
|
| 5 | must [verb] [v-ing] [det] | 6 |
|
