| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun sg] must be [prep] | 19 |
|
| 2 | [prep] [noun sg] must be [prep] | 19 |
|
| 3 | of [noun sg] must be [prep] | 13 |
|
| 4 | of [noun sg] must be [prep] | 13 |
|
| 5 | [prep] [noun sg] must be in | 5 |
|
