| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] [prep] [art] time | 15 |
|
| 2 | must be [vb pp] [prep] [art] time | 14 |
|
| 3 | must be [verb] [prep] the time | 13 |
|
| 4 | must be [verb] at [art] time | 11 |
|
