| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] [prep] [art] | 2092 |
|
| 2 | be [verb] back [prep] [art] | 1054 |
|
| 3 | must [verb] back [prep] [art] | 46 |
|
| 4 | must be [verb] back [prep] | 19 |
|
