| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be required to be | 133 |
|
| 2 | [is] required to be | 39 |
|
| 3 | is required to be | 39 |
|
| 4 | are required to be | 34 |
|
| 5 | [am/are] required to be | 34 |
|
| 6 | [was/were] required to be | 30 |
|
| 7 | [be] required to be | 26 |
|
| 8 | be required to be | 26 |
|
| 9 | were required to be | 17 |
|
| 10 | was required to be | 13 |
|
