| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] you must [vb infin] [is] [verb] | 9 |
|
| 2 | [Wh det] you must [vb infin] [be] [verb] | 9 |
|
| 3 | [Wh det] you must [vb infin] be [verb] | 9 |
|
| 4 | [Wh det] you must [vb infin] is [verb] | 9 |
|
