| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] required for this | 17 |
|
| 2 | be required for this | 17 |
|
| 3 | is required for this | 10 |
|
| 4 | [is] required for this | 10 |
|
| 5 | [noun] required for this | 9 |
|
| 6 | required for this [noun] | 20 |
|
| 7 | required for this [noun sg] | 20 |
|
