| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] to | 77926 |
|
| 2 | be [vb pp] to | 62721 |
|
| 3 | be required [prep] | 1713 |
|
| 4 | be require to | 194 |
|
| 5 | [be] required to | 193 |
|
