| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that be required | 134 |
|
| 2 | [that] is required | 58 |
|
| 3 | [that] are required | 53 |
|
| 4 | [that] was required | 13 |
|
| 5 | [that] were required | 8 |
|
