| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] [noun] must | 222 |
|
| 2 | at [pron] [noun] [vb mod] | 136 |
|
| 3 | at [pron] [noun] [modal v] | 136 |
|
| 4 | at [pron] [noun] must | 13 |
|
