| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] must be [prep] | 327 |
|
| 2 | must be use [prep] | 68 |
|
| 3 | [noun sg] must be use | 60 |
|
| 4 | [noun sg] be use [prep] | 33 |
|
