| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] which [vb mod] | 624 |
|
| 2 | [vb pp] which [vb mod] | 287 |
|
| 3 | required [pron] [vb mod] | 25 |
|
| 4 | required which [vb mod] | 11 |
|
| 5 | required which [modal v] | 11 |
|
| 6 | required [Wh det] [vb mod] | 11 |
|
| 7 | require which [vb mod] | 11 |
|
