| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] be [v-ing] [det] | 3596 |
|
| 2 | [pron] must be [v-ing] | 543 |
|
| 3 | [pron] must be [det] | 304 |
|
| 4 | must be [v-ing] [det] | 18 |
|
