| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] require [prep] [be] [verb] | 14 |
|
| 2 | [vb mod] [be] require [prep] [be] [verb] | 14 |
|
| 3 | [be] require [prep] [be] [verb] [prep] | 11 |
|
| 4 | [be] require [prep] [be] [verb] [prep] | 11 |
|
