| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] [prep] | 5097 |
|
| 2 | therefore be [verb] [prep] | 357 |
|
| 3 | must therefore be [verb] | 103 |
|
| 4 | must therefore [verb] [prep] | 29 |
|
