| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [prep] [pron] [noun] | 58 |
|
| 2 | it must be [prep] [noun] | 36 |
|
| 3 | it must be [prep] [pron] | 26 |
|
| 4 | it must be [pron] [noun] | 25 |
|
