| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | required [to-vb] [adj] [noun] | 430 |
|
| 2 | are [to-vb] [adj] [noun] | 206 |
|
| 3 | are required [to-vb] [adj] | 127 |
|
| 4 | are required [to-vb] [noun] | 79 |
|
