| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] require to [be] | 35 |
|
| 2 | [vb mod] be require to | 32 |
|
| 3 | be require to [be] | 26 |
|
| 4 | [vb mod] be to [be] | 24 |
|
