| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] [pron] must | 175 |
|
| 2 | [prep] [Wh det] [pron] must | 175 |
|
| 3 | by [Wh det] [pron] [vb mod] | 161 |
|
| 4 | by [Wh det] [pron] [modal v] | 161 |
|
| 5 | by [pron] [pron] must | 14 |
|
| 6 | by [Wh det] [pron] must | 8 |
|
| 7 | by [Wh det] [pron] must | 8 |
|
