| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [prep] [art] [noun sg] | 223 |
|
| 2 | be [prep] [art] [det] [noun sg] | 192 |
|
| 3 | must be [prep] [det] [noun sg] | 27 |
|
| 4 | must be [prep] [art] [det] | 12 |
|
| 5 | must be [art] [det] [noun sg] | 11 |
|
