| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [prep] the [noun] | 806 |
|
| 2 | [vb infin] back [prep] the [noun] | 538 |
|
| 3 | must [vb infin] back [prep] the | 43 |
|
| 4 | must [vb infin] back [prep] [noun] | 24 |
|
