| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be required | 6747 |
|
| 2 | [is] required | 2562 |
|
| 3 | is required | 2543 |
|
| 4 | [be] required | 1650 |
|
| 5 | be required | 1650 |
|
| 6 | [am/are] required | 1267 |
|
| 7 | are required | 1241 |
|
| 8 | [was/were] required | 1071 |
|
| 9 | was required | 685 |
|
| 10 | were required | 386 |
|
| 11 | been required | 107 |
|
| 12 | [been] required | 107 |
|
| 13 | [being] required | 90 |
|
| 14 | being required | 90 |
|
| 15 | 's required | 19 |
|
| 16 | be required | 13 |
|
| 17 | 're required | 9 |
|
