| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] [art] [noun sg] | 1387 |
|
| 2 | must be [prep] [art] [noun sg] | 223 |
|
| 3 | must be [v-ing] [prep] [art] | 51 |
|
| 4 | must be [v-ing] [art] [noun sg] | 36 |
|
| 5 | must be [v-ing] [prep] [noun sg] | 16 |
|
