| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [indef pn] which must [vb infin] | 7 |
|
| 2 | [indef pn] [Wh det] must have | 7 |
|
| 3 | [indef pn] [Wh det] must [vb infin] | 7 |
|
