| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] [prep] | 5095 |
|
| 2 | [be] [verb] back [prep] | 713 |
|
| 3 | must [verb] back [prep] | 108 |
|
| 4 | must [be] [verb] back | 28 |
|
| 5 | must [be] back [prep] | 9 |
|
