| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [noun] [Wh det] must | 6 |
|
| 2 | [is] [adj] [noun] which must | 6 |
|
| 3 | [is] [det] [noun] [Wh det] must | 5 |
|
| 4 | [is] [adj] [noun sg] [Wh det] must | 5 |
|
