| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [art] [noun] | 2493 |
|
| 2 | must be [art] [noun] | 1194 |
|
| 3 | must be [v-ing] [art] | 59 |
|
| 4 | must be [v-ing] [noun] | 36 |
|
