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